STAS00NOR 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) : SATREF Control Centre (satref@kartverket.no)
Date Prepared : 2024-10-18
Report Type : UPDATE
If Update:
Previous Site Log : stas00nor_20241017.log
Modified/Added Sections : 11
1. Site Identification of the GNSS Monument
Site Name : STAVANGER
Nine Character ID : STAS00NOR
Monument Inscription : STATENS KARTVERK
IERS DOMES Number : 10330M001
CDP Number : (A4)
Monument Description : STEEL MAST
Height of the Monument : 5.5 m
Monument Foundation : STEEL RODS
Foundation Depth : 0.5 m
Marker Description : BRASS NAIL
Date Installed : 1995-01-01
Geologic Characteristic : BEDROCK
Bedrock Type : IGNEOUS
Bedrock Condition : FRESH
Fracture Spacing : over 200 cm
Fault zones nearby : NO
Distance/activity : (multiple lines)
Additional Information : Day of year of installation not known
2. Site Location Information
City or Town : Stavanger
State or Province : ROGALAND
Country or Region : NOR
Tectonic Plate : EURASIAN
Approximate Position (ITRF)
X coordinate (m) : 3275753.905
Y coordinate (m) : 321110.862
Z coordinate (m) : 5445041.880
Latitude (N is +) : +590103.75
Longitude (E is +) : +0053555.03
Elevation (m,ellips.) : 104.9
Additional Information : Local name is: RANDABERG
3. GNSS Receiver Information
3.1 Receiver Type : TRIMBLE 4000SSI
Satellite System : GPS
Serial Number : 3511A10121
Firmware Version : 7.03
Elevation Cutoff Setting : 10 deg
Date Installed : 1995-05-22
Date Removed : 1998-06-09T14:41Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.2 Receiver Type : TRIMBLE 4000SSI
Satellite System : GPS
Serial Number : 3511A10121
Firmware Version : 7.28
Elevation Cutoff Setting : 10 deg
Date Installed : 1998-06-09T17:20Z
Date Removed : 2000-05-18
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.3 Receiver Type : TRIMBLE MS750
Satellite System : GPS
Serial Number : 220198237
Firmware Version : 1.20
Elevation Cutoff Setting : 7 deg
Date Installed : 2000-05-18
Date Removed : 2005-11-09T15:03Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.4 Receiver Type : TRIMBLE NETRS
Satellite System : GPS
Serial Number : 4531254532
Firmware Version : 1.1-3
Elevation Cutoff Setting : 5 deg
Date Installed : 2005-11-09T16:05Z
Date Removed : 2006-03-09T15:59Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.5 Receiver Type : TRIMBLE NETRS
Satellite System : GPS
Serial Number : 4531254532
Firmware Version : 1.1-5
Elevation Cutoff Setting : 5 deg
Date Installed : 2006-03-09T16:11Z
Date Removed : 2009-05-04T13:53Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.6 Receiver Type : TRIMBLE NETR8
Satellite System : GPS+GLO
Serial Number : 4843K33432
Firmware Version : 3.80
Elevation Cutoff Setting : 5 deg
Date Installed : 2009-05-04T14:18Z
Date Removed : 2009-08-31T18:20Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.7 Receiver Type : TRIMBLE NETR8
Satellite System : GPS+GLO
Serial Number : 4843K33432
Firmware Version : 4.03
Elevation Cutoff Setting : 5 deg
Date Installed : 2009-08-31T18:27Z
Date Removed : 2011-03-28T16:32Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.8 Receiver Type : TRIMBLE NETR8
Satellite System : GPS+GLO
Serial Number : 4843K33432
Firmware Version : 4.22
Elevation Cutoff Setting : 5 deg
Date Installed : 2011-03-28T16:53Z
Date Removed : 2014-10-16
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.9 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS+QZSS
Serial Number : 5323K43618
Firmware Version : 4.85
Elevation Cutoff Setting : 0 deg
Date Installed : 2014-10-16
Date Removed : 2015-01-29T17:00Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.10 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS+QZSS
Serial Number : 5323K43618
Firmware Version : 4.93
Elevation Cutoff Setting : 0 deg
Date Installed : 2015-01-29T17:00Z
Date Removed : 2015-06-15T00:00Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.11 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS+QZSS
Serial Number : 5323K43618
Firmware Version : 5.01
Elevation Cutoff Setting : 0 deg
Date Installed : 2015-06-15T00:00Z
Date Removed : 2016-01-20T12:00Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.12 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.01
Elevation Cutoff Setting : 0 deg
Date Installed : 2016-01-20T12:00Z
Date Removed : 2016-02-29T12:00Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.13 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.10
Elevation Cutoff Setting : 0 deg
Date Installed : 2016-02-29T12:00Z
Date Removed : 2017-03-16T13:05Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.14 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.20
Elevation Cutoff Setting : 0 deg
Date Installed : 2017-03-16T13:05Z
Date Removed : 2017-10-16T07:21Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.15 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.30
Elevation Cutoff Setting : 0 deg
Date Installed : 2017-10-16T07:21Z
Date Removed : 2018-11-29T08:56Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.16 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.37
Elevation Cutoff Setting : 0 deg
Date Installed : 2018-11-29T08:56Z
Date Removed : 2019-08-29T17:38Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.17 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.42
Elevation Cutoff Setting : 0 deg
Date Installed : 2019-08-29T17:38Z
Date Removed : 2019-10-31T16:25Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.18 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.43
Elevation Cutoff Setting : 0 deg
Date Installed : 2019-10-31T16:25Z
Date Removed : 2020-01-30T20:30Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.19 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.44
Elevation Cutoff Setting : 0 deg
Date Installed : 2020-01-30T20:30Z
Date Removed : 2021-11-25T17:46Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.20 Receiver Type : TRIMBLE NETR9
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 5323K43618
Firmware Version : 5.52
Elevation Cutoff Setting : 0 deg
Date Installed : 2021-11-25T17:46Z
Date Removed : 2022-11-24T17:18Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.21 Receiver Type : LEICA GR50
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 2090217
Firmware Version : 4.60.259
Elevation Cutoff Setting : 0 deg
Date Installed : 2022-11-24T17:18Z
Date Removed : 2024-03-06T12:19Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.22 Receiver Type : LEICA GR50
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 2090217
Firmware Version : 4.70.040
Elevation Cutoff Setting : 0 deg
Date Installed : 2024-03-06T12:19Z
Date Removed : 2024-10-16T15:00Z
Temperature Stabiliz. : none
Additional Information : (multiple lines)
3.23 Receiver Type : LEICA GR50
Satellite System : GPS+GLO+GAL+BDS
Serial Number : 2090217
Firmware Version : 4.80.109
Elevation Cutoff Setting : 0 deg
Date Installed : 2024-10-16T15:53Z
Date Removed : CCYY-MM-DDThh:mmZ
Temperature Stabiliz. : none
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 : TRM23903.00 DOME
Serial Number : 0220012753
Antenna Reference Point : BPA
Marker->ARP Up Ecc. (m) : 5.0830
Marker->ARP North Ecc(m) : -0.0020
Marker->ARP East Ecc(m) : 0.0000
Alignment from True N : 0 deg
Antenna Radome Type : DOME
Radome Serial Number :
Antenna Cable Type : Suhner 50
Antenna Cable Length : 40 m
Date Installed : 1995-05-22
Date Removed : 1997-10-10
Additional Information : Degree Offset from North : 180?
: Radome:45 degree angel roof
: made of glassfiber
: The antenna TR GEOD L1/L2 GP is
: not the right type
4.2 Antenna Type : TRM29659.00 DOME
Serial Number : 0220098659
Antenna Reference Point : BPA
Marker->ARP Up Ecc. (m) : 5.0830
Marker->ARP North Ecc(m) : -0.0020
Marker->ARP East Ecc(m) : 0.0000
Alignment from True N : 180 deg
Antenna Radome Type : DOME
Radome Serial Number :
Antenna Cable Type : Suhner 50
Antenna Cable Length : 40 m
Date Installed : 1997-10-10T09:12Z
Date Removed : 1998-06-09T14:41Z
Additional Information : Radome:45 dgree angel roof
: made of glassfiber
: Degree Offset from North : 180?
: Antenna contact was pointing
: towards South
4.3 Antenna Type : TRM29659.00 NONE
Serial Number : 0220098659
Antenna Reference Point : BPA
Marker->ARP Up Ecc. (m) : 5.5590
Marker->ARP North Ecc(m) : -0.0020
Marker->ARP East Ecc(m) : -0.0050
Alignment from True N : 0 deg
Antenna Radome Type : NONE
Radome Serial Number : 00013
Antenna Cable Type : Suhner 50
Antenna Cable Length : 40 m
Date Installed : 1998-06-09T17:20Z
Date Removed : 1999-12-15
Additional Information : Antenna contact points
: towards North
4.4 Antenna Type : TRM29659.00 SCIS
Serial Number : 0220098659
Antenna Reference Point : BPA
Marker->ARP Up Ecc. (m) : 5.5590
Marker->ARP North Ecc(m) : -0.0020
Marker->ARP East Ecc(m) : -0.0050
Alignment from True N : 0 deg
Antenna Radome Type : SCIS
Radome Serial Number : 00013
Antenna Cable Type : Suhner 50
Antenna Cable Length : 40 m
Date Installed : 1999-12-15
Date Removed : 2007-05-02T14:00Z
Additional Information : Antenna contact points
: towards North
4.5 Antenna Type : TRM55971.00 NONE
Serial Number : 30320746
Antenna Reference Point : BAM
Marker->ARP Up Ecc. (m) : 5.5590
Marker->ARP North Ecc(m) : -0.0020
Marker->ARP East Ecc(m) : -0.0050
Alignment from True N : 0 deg
Antenna Radome Type : NONE
Radome Serial Number :
Antenna Cable Type : Suhner 50
Antenna Cable Length : 40 m
Date Installed : 2007-05-02T14:58Z
Date Removed : 2007-06-30T10:04Z
Additional Information : Antenna contact points
: towards North
4.6 Antenna Type : TRM55971.00 NONE
Serial Number : 30336561
Antenna Reference Point : BAM
Marker->ARP Up Ecc. (m) : 5.5590
Marker->ARP North Ecc(m) : -0.0020
Marker->ARP East Ecc(m) : -0.0050
Alignment from True N : 0 deg
Antenna Radome Type : NONE
Radome Serial Number : N/A
Antenna Cable Type : Suhner 50
Antenna Cable Length : 40 m
Date Installed : 2007-07-03T12:57Z
Date Removed : CCYY-MM-DDThh:mmZ
Additional Information : Antenna contact points
: towards North
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 : ARP of TRIMBLE permanent L1/L2
Tied Marker Usage : LOCAL CONTROL/FOOTPRINT
Tied Marker CDP Number : (A4)
Tied Marker DOMES Number : (A9)
Differential Components from GNSS Marker to the tied monument (ITRS)
dx (m) : 2.606 m
dy (m) : 0.255 m
dz (m) : 4.357 m
Accuracy (mm) : 1 mm
Survey method : TRIANGULATION
Date Measured : 1995-05-21
Additional Information : Differential coordinates from the
: GPS monument to the reference and
: other monuments.
: The components are parallel to the
: XYZ-axes of the global geocentric
: reference system
: ITRF (WGS-84).
: Differential Components from GPS
: Mark to Site Reference (ITRS)
: ARP minus top bolt
5.2 Tied Marker Name : BPA of TRM29659.00
Tied Marker Usage : LOCAL CONTROL/FOOTPRINT
Tied Marker CDP Number : (A4)
Tied Marker DOMES Number : (A9)
Differential Components from GNSS Marker to the tied monument (ITRS)
dx (m) : 2.606 m
dy (m) : 0.255 m
dz (m) : 4.357 m
Accuracy (mm) : 1 mm
Survey method : TRIANGULATION
Date Measured : 1995-05-21
Additional Information : Differential coordinates from the
: GPS monument to the reference and
: other monuments.
: The components are parallel to the
: XYZ-axes of the global geocentric
: reference system ITRF (WGS-84).
: Differential Components from GPS
: Mark to Site Reference (ITRS)
: ARP minus top bolt
5.3 Tied Marker Name : BPA of TRM29659.00
Tied Marker Usage : LOCAL CONTROL/FOOTPRINT
Tied Marker CDP Number : (A4)
Tied Marker DOMES Number : (A9)
Differential Components from GNSS Marker to the tied monument (ITRS)
dx (m) : 2.851 m
dy (m) : 0.275 m
dz (m) : 4.764 m
Accuracy (mm) : 2 mm
Survey method : TRIANGULATION
Date Measured : 2000-10-12T00:00Z
Additional Information : Differential coordinates from the
: GPS monument to the reference and
: other monuments.
: The components are parallel to the
: XYZ-axes of the global geocentric
: reference system ITRF (WGS-84).
: Differential Components from GPS
: Mark to Site Reference (ITRS)
: ARP minus top bolt)
: Date Measured 09-JUN-1998 to
: 10-JUN-1998
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 : INTERNAL
Input Frequency : (if external)
Effective Dates : 1995-02-01/CCYY-MM-DD
Notes : (multiple lines)
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 : GNSS
Status : PERMANENT
Effective Dates : 2012-12-18/CCYY-MM-DD
Notes : Topcon NET-G3A receiver, used for performance
: monitoring of NMA RTK network.
: TPSG3_A1 antenna, mounted on a boom on same mast
: as STAS antenna.
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
8.1.1 Humidity Sensor Model : PTU303 / 5.14
Manufacturer : Vaisala
Serial Number : K2920004
Data Sampling Interval : 60 sec
Accuracy (% rel h) : 2 % rel h
Aspiration : NATURAL
Height Diff to Ant : 0.5 m
Calibration date : 2014-07-17
Effective Dates : 2014-10-17/CCYY-MM-DD
Notes : (multiple lines)
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)
8.2.1 Pressure Sensor Model : PTU303 / 5.14
Manufacturer : Vaisala
Serial Number : K2920004
Data Sampling Interval : 60 sec
Accuracy : 0.01 hPa
Height Diff to Ant : 0.5 m
Calibration date : 2014-07-17
Effective Dates : 2014-10-17/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)
8.3.1 Temp. Sensor Model : PTU303 / 5.14
Manufacturer : Vaisala
Serial Number : K2920004
Data Sampling Interval : 60 sec
Accuracy : 0.1 deg C
Aspiration : NATURAL
Height Diff to Ant : 0.5 m
Calibration date : 2014-07-17
Effective Dates : 2014-10-17/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.x Multipath Sources : (METAL ROOF/DOME/VLBI ANTENNA/etc)
Effective Dates : (CCYY-MM-DD/CCYY-MM-DD)
Additional Information : (multiple lines)
9.3.1 Signal Obstructions : TREES
Effective Dates : 1995-01-01/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 : Norwegian Mapping Authority
: Geodetic Institute
Preferred Abbreviation : NMA
Mailing Address : Kartverksveien 21 / P.O.Box 600 Sentrum
: N-3507 Honefoss
: Norway
Primary Contact
Contact Name : SATREF Control Centre
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail : satref@kartverket.no
Secondary Contact
Contact Name : Dr. Aasmund Steen Skjaeveland
Telephone (primary) : +47 32 11 84 52
Telephone (secondary) :
Fax : +47 32 11 81 01
E-mail : asmund.skjaeveland@kartverket.no
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 or URL)
Horizon Mask : (Y or URL)
Monument Description : (Y or URL)
Site Pictures : (Y or URL)
Additional Information : (multiple lines)
Antenna Graphics with Dimensions
TRM55971.00
/ --------------------------------------------- \
+ +
\ --------------------------------------------- /
\ /
\ /
\-----x-----/ <-- 0.0000 BAM=ARP
RXC=NRP
<-- 0.3396 --> Notches
ARP: Antenna Reference Point
L1 : L1 Phase Center L2 : L2 Phase Center
