SPT000SWE Site Information Form (site log v2.0)
     International GNSS Service
     See Instructions at:
       https://files.igs.org/pub/station/general/sitelog_instr_v2.0.txt


0.   Form

     Prepared by (full name)  : SWEPOS Control Centre
     Date Prepared            : 2022-12-08
     Report Type              : UPDATE
     If Update:
      Previous Site Log       : spt000swe_20220506.log
      Modified/Added Sections : 3.17, 3.18


1.   Site Identification of the GNSS Monument

     Site Name                : SP Boras
     Nine Character ID        : SPT000SWE
     Monument Inscription     : 
     IERS DOMES Number        : 10425M001
     CDP Number               : (A4)
     Monument Description     : PILLAR
       Height of the Monument : (m)
       Monument Foundation    : (STEEL RODS, CONCRETE BLOCK, ROOF, etc)
       Foundation Depth       : (m)
     Marker Description       : (CHISELLED CROSS/DIVOT/BRASS NAIL/etc)
     Date Installed           : 1995-12-01T00:00Z
     Geologic Characteristic  : BEDROCK
       Bedrock Type           : (IGNEOUS/METAMORPHIC/SEDIMENTARY)
       Bedrock Condition      : FRESH
       Fracture Spacing       : over 200 cm
       Fault zones nearby     : (YES/NO/Name of the zone)
         Distance/activity    : (multiple lines)
     Additional Information   : Swedish permanent GNSS Network (SWEPOS)
                              : Mark at the centre of a horizontal metal plate
                              : embedded on the concrete monument.
                              : GABBRO bedrock.
                              : The same monument and antenna has been used for
                              : the IGEX/IGLOS-site SP0G up to 2003-08-19.


2.   Site Location Information

     City or Town             : Boras
     State or Province        : N/A
     Country or Region        : SWE
     Tectonic Plate           : EURASIAN
     Approximate Position (ITRF)
       X coordinate (m)       : 3328984.813
       Y coordinate (m)       : 761910.066
       Z coordinate (m)       : 5369033.475
       Latitude (N is +)      : +574253.84
       Longitude (E is +)     : +0125328.84
       Elevation (m,ellips.)  : 219.9
     Additional Information   : SWEREF 99 (Swedish realisation of ETRS89).


3.   GNSS Receiver Information

3.1  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : 603
     Firmware Version         : 1F00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 1995-12-14T00:00Z
     Date Removed             : 1996-06-16T00:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Full S/N 04603.
                              : Approximate dates for installation and removal.

3.2  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : 941
     Firmware Version         : 1G00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 1996-06-17T00:00Z
     Date Removed             : 1997-04-21T00:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Full S/N 700570B04941.
                              : Approximate dates for installation and removal.

3.3  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : 941
     Firmware Version         : 1G00
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 1997-04-21T00:00Z
     Date Removed             : 1997-12-16T00:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Full S/N 700570B04941.
                              : Approximate dates for installation and removal.

3.4  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : 941
     Firmware Version         : 1I00
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 1997-12-17T00:00Z
     Date Removed             : 1998-07-09T00:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Full S/N 700570B04941.
                              : Approximate dates for installation and removal.
                              : Secondary receiver on site was possibly
                              : ASHTECH Z-XII3, S/N 837 (LP02837).

3.5  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : 941
     Firmware Version         : CB00
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 1998-07-10T00:00Z
     Date Removed             : 1999-08-24T00:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Full S/N 700570B04941.
                              : Approximate dates for installation and removal.
                              : Secondary receiver on site was ASHTECH Z-XII3,
                              : S/N 837 (LP02837).

3.6  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : 941
     Firmware Version         : CC00
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 1999-08-25T00:00Z
     Date Removed             : 2001-09-05T00:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Full S/N 700570B04941.
                              : Approximate dates for installation and removal.
                              : Secondary receiver on site was ASHTECH Z-XII3,
                              : S/N 837 (LP02837).

3.7  Receiver Type            : JPS LEGACY
     Satellite System         : GPS+GLO
     Serial Number            : MT311430635
     Firmware Version         : 1.9 Aug,11,1999 pl4
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 2001-09-06T00:00Z
     Date Removed             : 2003-06-23
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.8  Receiver Type            : JPS LEGACY
     Satellite System         : GPS+GLO
     Serial Number            : MT311430635
     Firmware Version         : 2.3 May,13,2003 p1
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 2003-06-23
     Date Removed             : 2004-11-22T15:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Firmware upgrade.

3.9  Receiver Type            : JPS LEGACY
     Satellite System         : GPS+GLO
     Serial Number            : MT311430635
     Firmware Version         : 2.3 Apr,28,2004 p4
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 2004-11-22T15:00Z
     Date Removed             : 2008-05-06T09:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : Firmware upgrade.

3.10 Receiver Type            : JPS E_GGD
     Satellite System         : GPS+GLO
     Serial Number            : AFFE4GQHRLS
     Firmware Version         : 2.6.1 Jan,10,2008
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 2008-05-06T09:00Z
     Date Removed             : 2012-01-16T14:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.11 Receiver Type            : JAVAD TRE_G3TH DELTA
     Satellite System         : GPS+GLO
     Serial Number            : 00319
     Firmware Version         : 3.3.5 Nov,16,2011
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 2012-01-16T14:00Z
     Date Removed             : 2014-01-14T17:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.12 Receiver Type            : JAVAD TRE_G3TH DELTA
     Satellite System         : GPS+GLO
     Serial Number            : 00319
     Firmware Version         : 3.3.5 Nov,16,2011
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2014-01-14T17:00Z
     Date Removed             : 2015-02-09T15:15Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.13 Receiver Type            : JAVAD TRE_G3TH DELTA
     Satellite System         : GPS+GLO
     Serial Number            : 00319
     Firmware Version         : 3.5.6 Aug,14,2014
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2015-02-09T15:15Z
     Date Removed             : 2015-11-17T10:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.14 Receiver Type            : JAVAD TRE_G3TH DELTA
     Satellite System         : GPS+GLO
     Serial Number            : 00319
     Firmware Version         : 3.5.12 Nov,12,2015
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2015-11-17T10:00Z
     Date Removed             : 2019-04-02T10:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.15 Receiver Type            : SEPT POLARX5TR
     Satellite System         : GPS+GLO+GAL+BDS+SBAS
     Serial Number            : 3046430
     Firmware Version         : 5.2.0
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2019-04-02T10:00Z
     Date Removed             : 2019-09-30T10:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.16 Receiver Type            : SEPT POLARX5TR
     Satellite System         : GPS+GLO+GAL+BDS+SBAS
     Serial Number            : 3046430
     Firmware Version         : 5.3.0
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2019-09-30T10:00Z
     Date Removed             : 2021-03-19T12:00Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.17 Receiver Type            : SEPT POLARX5TR
     Satellite System         : GPS+GLO+GAL+BDS+SBAS
     Serial Number            : 3046430
     Firmware Version         : 5.4.0
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2021-03-19T12:00Z
     Date Removed             : 2022-12-08T09:59Z
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.18 Receiver Type            : SEPT POLARX5TR
     Satellite System         : GPS+GLO+GAL+BDS+SBAS
     Serial Number            : 3046430
     Firmware Version         : 5.5.0
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2022-12-08T10:00Z
     Date Removed             : CCYY-MM-DDThh:mmZ
     Temperature Stabiliz.    : 23.0 +/- 1.0
     Additional Information   : (multiple lines)

3.x  Receiver Type            : (A20, from rcvr_ant.tab; see instructions)
     Satellite System         : (GPS+GLO+GAL+BDS+QZSS+IRNSS+SBAS)
     Serial Number            : (A20, but note the first A5 is used in SINEX)
     Firmware Version         : (A11)
     Elevation Cutoff Setting : (deg)
     Date Installed           : (CCYY-MM-DDThh:mmZ)
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Temperature Stabiliz.    : (none or tolerance in degrees C)
     Additional Information   : (multiple lines)


4.   GNSS Antenna Information

4.1  Antenna Type             : AOAD/M_T        OSOD
     Serial Number            : 258
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  :   0.0710
     Marker->ARP North Ecc(m) :   0.0000
     Marker->ARP East Ecc(m)  :   0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : OSOD
     Radome Serial Number     : 
     Antenna Cable Type       : Andrew Heliax LDF2-50
     Antenna Cable Length     : 70 m
     Date Installed           : 1995-12-01
     Date Removed             : 2016-08-23T07:15Z
     Additional Information   : (multiple lines)

4.2  Antenna Type             : JNSCR_C146-22-1 OSOD
     Serial Number            : 00275
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  :   0.0710
     Marker->ARP North Ecc(m) :   0.0000
     Marker->ARP East Ecc(m)  :   0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : OSOD
     Radome Serial Number     : 
     Antenna Cable Type       : Andrew Heliax LDF2-50
     Antenna Cable Length     : 70 m
     Date Installed           : 2016-08-23T07:15Z
     Date Removed             : 2020-08-13T08:30Z
     Additional Information   : (multiple lines)

4.3  Antenna Type             : TRM59800.00     OSOD
     Serial Number            : 5025353801
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  :   0.0710
     Marker->ARP North Ecc(m) :   0.0000
     Marker->ARP East Ecc(m)  :   0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : OSOD
     Radome Serial Number     : 
     Antenna Cable Type       : Andrew Heliax LDF2-50
     Antenna Cable Length     : 70 m
     Date Installed           : 2020-08-13T10:00Z
     Date Removed             : CCYY-MM-DDThh:mmZ
     Additional Information   : Microwave absorbing material Eccosorb is
                              : attached to the bottom of the chokering
                              : Outdoor part of cable is temperature stabilized,
                              : located in a pipe with circulating water

4.x  Antenna Type             : (A20, from rcvr_ant.tab; see instructions)
     Serial Number            : (A*, but note the first A5 is used in SINEX)
     Antenna Reference Point  : (BPA/BCR/XXX from "antenna.gra"; see instr.)
     Marker->ARP Up Ecc. (m)  : (F8.4)
     Marker->ARP North Ecc(m) : (F8.4)
     Marker->ARP East Ecc(m)  : (F8.4)
     Alignment from True N    : (deg; + is clockwise/east)
     Antenna Radome Type      : (A4 from rcvr_ant.tab; see instructions)
     Radome Serial Number     : 
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : (CCYY-MM-DDThh:mmZ)
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Additional Information   : (multiple lines)


5.   Surveyed Local Ties

5.1  Tied Marker Name         : Boras (BOR0)
     Tied Marker Usage        : LOCAL CONTROL
     Tied Marker CDP Number   : (A4)
     Tied Marker DOMES Number : (A9)
     Differential Components from GNSS Marker to the tied monument (ITRS)
       dx (m)                 : 0.000 m
       dy (m)                 : 0.000 m
       dz (m)                 : 0.000 m
     Accuracy (mm)            : 0 mm
     Survey method            : TRILATERATION/TRIANGULATION
     Date Measured            : 1995-12-01T00:00Z
     Additional Information   : (multiple lines)

5.x  Tied Marker Name         : 
     Tied Marker Usage        : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc)
     Tied Marker CDP Number   : (A4)
     Tied Marker DOMES Number : (A9)
     Differential Components from GNSS Marker to the tied monument (ITRS)
       dx (m)                 : (m)
       dy (m)                 : (m)
       dz (m)                 : (m)
     Accuracy (mm)            : (mm)
     Survey method            : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc)
     Date Measured            : (CCYY-MM-DDThh:mmZ)
     Additional Information   : (multiple lines)


6.   Frequency Standard

6.1  Standard Type            : EXTERNAL CESIUM
       Input Frequency        : 10 MHz
       Effective Dates        : 1995-12-01/2003-10-27
       Notes                  : (multiple lines)

6.2  Standard Type            : EXTERNAL H-MASER
       Input Frequency        : 5 MHz
       Effective Dates        : 2003-10-27/2008-03-18
       Notes                  : Cesium replaced with Hydrogen Maser at
                              : 16:30 UT

6.3  Standard Type            : EXTERNAL H-MASER
       Input Frequency        : 5 MHz
       Effective Dates        : 2008-03-18/2008-03-20
       Notes                  : Unstable frequency due to maintenance
                              : work on the maser

6.4  Standard Type            : EXTERNAL H-MASER
       Input Frequency        : 5 MHz
       Effective Dates        : 2008-03-20/2009-04-09
       Notes                  : Hydrogen maser back to normal operation

6.5  Standard Type            : EXTERNAL H-MASER
       Input Frequency        : 10 MHz
       Effective Dates        : 2009-04-09/2019-04-02
       Notes                  : Prev. maser replaced due to unstable frequency

6.6  Standard Type            : EXTERNAL H-MASER
       Input Frequency        : 10 MHz
       Effective Dates        : 2019-04-02/CCYY-MM-DD
       Notes                  : Time and frequency from UTC(SP). H-Maser based

6.x  Standard Type            : (INTERNAL or EXTERNAL H-MASER/CESIUM/etc)
       Input Frequency        : (if external)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)


7.   Collocation Information

7.1  Instrumentation Type     : GPS
       Status                 : PERMANENT
       Effective Dates        : 1995-12-01/CCYY-MM-DD
       Notes                  : BIPM, SWEPOS, and IGS receivers
                              : share the same pillar/antenna system.
                              : The GPS site SPT0 and the GPS/GLONASS
                              : site SP0G have been merged into site SPT0,
                              : equipped with a GPS/GLONASS receiver.

7.2  Instrumentation Type     : ABSOLUTE GRAVITY
       Status                 : MOBILE
       Effective Dates        : 2003-06-16/2003-06-17
       Notes                  : (multiple lines)

7.3  Instrumentation Type     : TIME
       Status                 : PERMANENT
       Effective Dates        : 2003-10-21/CCYY-MM-DD
       Notes                  : Ku band ground station for TWSTFT used for
                              : international comparison of UTC(SP)

7.4  Instrumentation Type     : GNSS
       Status                 : PERMANENT
       Effective Dates        : 2011-10-07/CCYY-MM-DD
       Notes                  : EPN station SPT0

7.5  Instrumentation Type     : ABSOLUTE GRAVITY
       Status                 : MOBILE
       Effective Dates        : 2013-04-19/2013-04-21
       Notes                  : Observation performed by Lantmateriet.

7.6  Instrumentation Type     : GNSS
       Status                 : PERMANENT
       Effective Dates        : 2018-01-01/CCYY-MM-DD
       Notes                  : RIT1/SP06 connected to same antenna as SPT7
                              : Main receiver for UTC(SP)

7.7  Instrumentation Type     : GNSS
       Status                 : PERMANENT
       Effective Dates        : 2018-02-01/CCYY-MM-DD
       Notes                  : RIT2/SP07 connected to same antenna as SPT0
                              : Time and frequency from UTC(SP). H-Maser based

7.x  Instrumentation Type     : (GPS/GLONASS/DORIS/PRARE/SLR/VLBI/TIME/etc)
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)


8.   Meteorological Instrumentation

8.1.x  Humidity Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy (% rel h)     : (% rel h)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.2.x  Pressure Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy               : (hPa)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.3.x  Temp. Sensor Model     : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy               : (deg C)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.4.x  Water Vapor Radiometer : 
       Manufacturer           : 
       Serial Number          : 
       Distance to Antenna    : (m)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.5.x  Other Instrumentation  : (multiple lines)


9.   Local Ongoing Conditions Possibly Affecting Computed Position

9.1.x  Radio Interferences    : (TV/CELL PHONE ANTENNA/RADAR/etc)
       Observed Degradations  : (SN RATIO/DATA GAPS/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)

9.2.1  Multipath Sources      : MULTIPATH REDUCTION
       Effective Dates        : 2007-06-08/2016-08-23
       Additional Information : Microwave absorbing material Eccosorb was
                              : mounted around and beneath the antenna to
                              : reduce multipath.

9.2.2  Multipath Sources      : RADOME HEATING
       Effective Dates        : 2009-09-30/CCYY-MM-DD
       Additional Information : A fan system for removal of snow on the radome
                              : is installed. The fan heats the air under the
                              : radome.

9.2.3  Multipath Sources      : TEMPORARY SCAFFOLD AROUND PILLAR
       Effective Dates        : 2016-08-18/2016-09-05
       Additional Information : A scaffold was erected around the pillar for the
                              : antenna replacement that was carried out
                              : 2016-08-23.

9.2.4  Multipath Sources      : MULTIPATH REDUCTION
       Effective Dates        : 2016-08-26/CCYY-MM-DD
       Additional Information : Microwave absorbing material Eccosorb was
                              : mounted beneath the antenna to
                              : reduce multipath.

9.2.x  Multipath Sources      : (METAL ROOF/DOME/VLBI ANTENNA/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)

9.3.x  Signal Obstructions    : (TREES/BUILDINGS/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)


10.  Local Episodic Effects Possibly Affecting Data Quality

10.x  Date                    : (CCYY-MM-DD/CCYY-MM-DD)
      Event                   : (TREE CLEARING/CONSTRUCTION/etc)


11.  On-Site, Point of Contact Agency Information

     Agency                   : Lantmäteriet, the Swedish mapping, cadastral
                              : and land registration authority
     Preferred Abbreviation   : LMV
     Mailing Address          : Lantmäteriet
                              : SE-801 82 Gävle
                              : Sweden
     Primary Contact
       Contact Name           : SWEPOS Control Centre
       Telephone (primary)    : +46 26 63 37 53
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : swepos@lm.se
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : (multiple lines)




12.  Responsible Agency (if different from 11.)

     Agency                   : (multiple lines)
     Preferred Abbreviation   : (A10)
     Mailing Address          : (multiple lines)
     Primary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : (multiple lines)


13.  More Information

     Primary Data Center      : BKG
     Secondary Data Center    : BEV
     URL for More Information : 
     Hardcopy on File
       Site Map               : (Y or URL)
       Site Diagram           : Y
       Horizon Mask           : Y
       Monument Description   : Y
       Site Pictures          : Y
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions

TRM59800.00

                         -----
                     /           \
                    |             |
  +-------------------------------------------------+     <--  0.1020  TCR
  |                                                 |
  |                                                 |
  |                                                 |
  |                                                 |
+-+-------------------------------------------------+-+   <--  0.0381
+-------------------+-------------+-------------------+   <--  0.0350  BCR
                    |             |
                   =|             |
                    +------x------+                       <--  0.0000  BPA=ARP
                                                                       RXC=NRP
<--                      0.3810                     -->