CIRCULAR T 368 ISSN 1143-1393
2018 SEPTEMBER 10, 10h UTC
BUREAU INTERNATIONAL DES POIDS ET MESURES
THE INTERGOVERNMENTAL ORGANIZATION ESTABLISHED BY THE METRE CONVENTION
PAVILLON DE BRETEUIL F-92312 SEVRES CEDEX TEL. +33 1 45 07 70 70 tai@bipm.org

The contents of the sections of BIPM Circular T are fully described in the document " Explanatory supplement to BIPM Circular T "
available at https://webtai.bipm.org/ftp/pub/tai/other-products/notes/explanatory_supplement_v0.1.pdf

1 - Difference between UTC and its local realizations UTC(k) and corresponding uncertainties. From 2017 January 1, 0h UTC, TAI-UTC = 37 s.
Date 2018 0h UTC JUL 30 AUG 4 AUG 9 AUG 14 AUG 19 AUG 24 AUG 29 Uncertainty/ns Notes
MJD 58329 58334 58339 58344 58349 58354 58359 uA uB u
Laboratory k [UTC-UTC(k)]/ns
AOS (Borowiec) 2.2 2.1 1.5 0.9 0.3 -1.1 -2.1 0.4 4.1 4.1
APL (Laurel) 3.8 0.4 0.4 -0.6 - -1.9 -1.6 0.4 11.3 11.3
AUS (Sydney) -16.0 -15.9 -18.4 -23.5 -41.6 -45.4 -39.5 0.4 6.4 6.4
BEV (Wien) -24.2 -30.7 -37.3 -36.9 -28.0 -20.6 -10.8 0.4 3.2 3.2
BIM (Sofiya) - - - - - - -
BIRM (Beijing) 10.5 10.9 10.0 9.7 9.5 11.7 13.0 0.5 3.1 3.1
BOM (Skopje) -524.4 -554.7 -571.8 -600.0 -628.6 -648.9 -676.6 1.5 8.2 8.3
BY (Minsk) 2.9 3.6 2.7 0.6 -0.6 -0.4 -1.5 1.5 12.2 12.3
CAO (Cagliari) -5733.8 -5834.0 -5933.8 -6035.9 -6130.8 -6229.2 -6328.6 1.5 20.0 20.1
CH (Bern-Wabern) 0.9 -0.2 -2.5 -4.6 -3.2 -1.0 0.0 0.4 2.2 2.2
CNES (Toulouse) 0.8 -0.5 3.4 7.8 11.6 13.6 20.0 0.4 4.6 4.6
CNM (Queretaro) -6.3 -8.1 -1.5 -2.3 -7.9 -7.1 6.9 2.5 11.2 11.5
CNMP (Panama) -3.7 9.2 -2.6 -10.1 -19.2 -14.4 3.9 0.7 7.4 7.4
DFNT (Tunis) 1178.1 1377.1 243.0 430.8 - 268.2 472.2 0.7 20.0 20.1
DLR (Oberpfaffenhofen) - - - - - - -
DMDM (Belgrade) 2.1 7.1 -5.2 -15.4 -29.2 -44.3 -53.5 0.4 3.2 3.2
DTAG (Frankfurt/M) -57.7 -68.7 -76.7 -72.9 -91.8 -94.3 -95.5 0.7 3.1 3.2
EIM (Thessaloniki) 14.6 6.0 6.7 - - 15.3 9.1 3.0 11.3 11.7
ESTC (Noordwijk) -0.4 -0.3 -0.3 -0.8 -1.6 -1.9 -1.2 0.4 3.1 3.1
HKO (Hong Kong) 128.1 147.5 160.9 178.4 191.6 204.2 225.8 0.4 7.8 7.8
ICE (San Jose) -47.8 -52.2 -57.1 -50.5 -41.5 -45.0 -45.0 5.0 20.0 20.7
IFAG (Wettzell) -946.9 -963.2 -975.6 -985.5 -996.4 -1011.2 -1021.3 0.4 5.2 5.2
IGNA (Buenos Aires) 4.2 5.6 4.4 3.1 7.2 6.4 4.7 2.5 20.0 20.2
IMBH (Sarajevo) -0.3 -0.9 -0.2 -3.9 -1.2 1.5 2.0 0.4 7.2 7.2
INCP (Lima) 459.8 445.1 441.6 430.9 431.0 434.5 429.3 5.0 20.0 20.7
INM (Bogota D.C.) -3.9 -13.4 -5.0 -7.5 -4.9 -0.3 -8.1 2.0 20.0 20.1
INPL (Jerusalem) -185.4 -215.6 -245.9 -278.7 -305.4 -329.9 -359.0 0.4 7.2 7.2
INTI (Buenos Aires) -25.9 -33.7 -38.6 -38.7 -35.3 -30.6 -28.2 2.5 20.0 20.2
INXE (Rio de Janeiro) -25.1 -19.9 -15.0 -6.3 -9.0 -8.3 -0.6 0.4 20.0 20.0
IPQ (Caparica) -31.7 -27.2 -29.3 -29.7 -34.8 -34.0 -22.7 0.5 20.0 20.0
IT (Torino) 0.8 1.1 1.8 1.0 1.3 1.8 2.3 0.4 1.7 1.8
JATC (Lintong) -0.2 4.1 3.8 3.9 5.4 2.8 2.7 0.7 3.1 3.2
JV (Kjeller) -20.1 0.0 18.9 30.8 42.9 52.1 62.2 0.4 20.0 20.0
KEBS (Nairobi) - - - - - - -
KIM (Serpong-Tangerang) 665.2 655.6 675.8 696.5 697.0 702.7 714.2 2.0 20.0 20.1
KRIS (Daejeon) 20.2 22.7 19.6 17.0 14.5 12.2 9.8 0.4 3.0 3.0
KZ (Astana) -235.6 -228.6 -246.1 -192.3 -232.0 -222.5 -215.0 1.5 12.3 12.4
LT (Vilnius) 382.6 371.0 369.2 369.1 384.4 386.5 394.8 2.0 11.3 11.4
MASM (Bayanzurkh) -417.5 -424.8 -444.5 -455.4 -463.4 -477.4 -494.2 0.7 20.0 20.1
MBM (Podgorica) - - - - - - -
MIKE (Espoo) -7.7 -7.6 -8.2 -7.6 -6.7 -6.2 -5.9 0.4 4.5 4.5
MKEH (Budapest) -3575.6 -3797.9 -4017.7 - - - 46.0 1.5 20.0 20.1
MSL (Lower Hutt) 402.5 433.2 425.2 460.7 458.8 470.0 484.9 1.5 20.0 20.1
MTC (Makkah) -33.6 -38.2 -35.8 -38.4 -41.3 -46.1 -40.0 0.4 7.7 7.7
NAO (Mizusawa) -117.1 -123.0 -132.3 -138.5 -151.5 -161.1 -171.4 2.0 20.0 20.1
NICT (Tokyo) 2.9 3.7 4.4 6.0 4.6 4.4 7.9 0.4 2.6 2.6
NIM (Beijing) 0.9 1.7 1.6 2.3 2.8 2.3 2.1 0.4 2.4 2.4
NIMB (Bucharest) 2913.6 2968.3 3017.2 3066.5 3110.5 3163.7 3209.7 0.4 7.4 7.4
NIMT (Pathumthani) -225.7 -230.7 -255.3 -273.5 -292.6 -302.0 -310.9 1.5 3.6 3.9
NIS (Cairo) 2.6 -8.7 -17.4 -6.3 1.5 4.9 3.3 1.6 20.0 20.1
NIST (Boulder) -1.0 -0.6 -0.5 -0.1 0.2 -0.1 0.1 0.4 2.1 2.1
NMIJ (Tsukuba) 5.1 7.1 8.1 9.7 9.3 9.6 10.0 0.4 3.3 3.3
NMLS (Sepang) -1798.3 -1829.1 -1862.7 -1895.5 -1929.5 -1967.1 -2001.8 1.5 3.6 3.9
NPL (Teddington) -4.2 -4.2 -4.6 -4.0 -4.5 -4.0 -2.3 0.4 3.0 3.0
NPLI (New-Delhi) -2.6 0.3 3.9 9.0 17.0 19.2 17.1 0.4 7.2 7.2
NRC (Ottawa) 17.8 6.0 -8.4 -11.2 -11.6 -3.2 2.1 0.4 2.9 2.9
NRL (Washington DC) - - - - - - -
NTSC (Lintong) 3.0 1.3 1.1 2.0 2.6 0.7 1.1 0.4 2.5 2.6
ONBA (Buenos Aires) -2164.7 -2132.0 -2140.0 -2133.8 -2133.4 -2111.5 -2101.3 2.0 11.3 11.5
ONRJ (Rio de Janeiro) 5.5 1.6 -5.3 4.5 -2.0 1.8 -2.8 0.4 7.9 7.9
OP (Paris) -1.9 -2.0 -1.9 -1.2 -0.4 0.1 1.0 0.4 1.7 1.8
ORB (Bruxelles) 1.6 1.3 1.3 1.0 0.6 0.0 -0.6 0.4 3.0 3.1
PL (Warszawa) 29.0 13.6 2.5 2.9 3.2 3.9 4.6 0.4 4.2 4.2
PTB (Braunschweig) -1.2 -1.3 -1.4 -1.5 -1.6 -1.6 -1.6 0.2 1.3 1.3
ROA (San Fernando) -3.1 -3.6 -3.2 -4.6 -5.6 -6.2 -6.2 0.4 2.0 2.0
SASO (Riyadh) -1053.6 -1056.5 -1072.7 -1091.0 -1105.3 -1123.4 -1132.4 0.5 3.1 3.1
SCL (Hong Kong) 15.2 26.4 40.1 50.8 56.7 68.6 75.7 1.0 20.0 20.1
SG (Singapore) 151.1 138.0 143.9 128.2 104.8 81.4 105.1 0.4 6.6 6.6
SIQ (Ljubljana) 411.9 389.0 371.5 357.4 369.9 378.5 383.7 0.4 7.5 7.5
SL (Colombo) - 32.4 23.9 8.1 2.4 1.4 -3.4 0.7 20.0 20.1
SMD (Bruxelles) -12.5 -19.8 -2.9 4.1 -4.6 -3.4 0.8 0.4 3.1 3.1
SMU (Bratislava) -1864.7 -1874.6 -1871.9 -1886.3 -1894.0 -1902.9 -1909.2 1.5 12.3 12.4
SP (Boras) -3.2 -2.7 -2.4 -2.0 -1.6 -1.3 -1.1 0.4 1.7 1.7
SU (Moskva) 0.6 0.5 1.0 0.8 0.6 0.5 -0.6 1.3 6.9 7.0
TL (Chung-Li) 2.9 2.4 1.5 1.4 0.2 -0.4 0.1 0.4 2.6 2.6
TP (Praha) -4.9 -8.1 -16.8 -15.6 -26.5 -41.7 -46.9 0.4 6.7 6.7
UA (Kharkov) 5.1 1.9 -1.1 -7.2 4.1 6.6 3.7 1.5 9.1 9.2
UAE (Abu Dhabi) - - - - - - -
UME (Gebze-Kocaeli) -580.4 -598.0 -600.4 -598.6 -601.2 -595.1 -599.0 0.7 3.3 3.3
USNO (Washington DC) 0.1 -0.3 -0.9 -1.3 -0.7 -0.7 0.0 0.3 1.5 1.5
VMI (Ha Noi) 25.6 -15.8 -28.7 -14.3 -19.5 -9.0 -0.3 3.0 3.6 4.7
VSL (Delft) 4.2 8.0 18.6 11.5 17.5 13.2 -3.3 0.4 1.8 1.9
ZA (Pretoria) 4.8 1.7 0.6 2.7 3.0 1.4 2.1 0.4 4.3 4.4

2 - Difference between the normalized frequencies of EAL and TAI.
Interval of validity f(EAL)-f(TAI)
Steering correction 58329 - 58359 6.501x10-13 (2018 JUL 30 - 2018 AUG 29)
New correction 58359 - 58389 6.501x10-13 (2018 AUG 29 - 2018 SEP 28)
New correction foreseen 58389 - 58419 6.501x10-13 (2018 SEP 28 - 2018 OCT 28)

3 - Duration of the TAI scale interval d.

Table 1: Estimate of d by individual PSFS measurements and corresponding uncertainties.
All values are expressed in 10-15 and are valid only for the stated period of estimation.
Standard Period of d uA uB ul/lab ul/Tai u uSrep Ref(uS) Ref(uB) uB(Ref) Steer Note
Estimation
PTB-CS1 58329 58359 3.98 8.00 8.00 0.00 0.13 11.31 PFS/NA T148 8. Y (1)
PTB-CS2 58329 58359 -6.55 5.00 12.00 0.00 0.13 13.00 PFS/NA T148 12. Y (1)
SU-CsFO2 58329 58359 0.54 0.52 0.24 0.13 0.85 1.03 PFS/NA T315 0.50 Y (2)
SYRTE-FO1 58329 58359 0.48 0.20 0.34 0.05 0.26 0.48 PFS/NA T301 0.37 Y (3)
SYRTE-FO2 58329 58359 0.49 0.20 0.21 0.05 0.26 0.39 PFS/NA T301 0.23 Y (3)
SYRTE-FORb 58334 58359 0.44 0.20 0.25 0.08 0.31 0.45 0.6 [1] T328 0.34 Y (3)

Notes:
(1) Continuously operating as a clock participating to TAI
(2) Report 31 AUG. 2018 by SU
(3) Report 30 AUG. 2018 by LNE-SYRTE
[1] CCTF Recommendation 2 (2017) : Updates to the CIPM list of standard frequencies in Consultative
Committee for Time and Frequency Report of the 21st meeting (2017), 2017, 56 p.

Table 2: Estimate of d by the BIPM based on all PSFS measurements identified to be used for TAI steering
over the period MJD57969-58359, and corresponding uncertainties.

Period of estimation d u
58329-58359 0.47x10-15 0.24x10-15 (2018 JUL 30 - 2018 AUG 29)

4 - Relations of UTC and TAI with predictions of UTC(k) disseminated by GNSS.

[UTC-UTC(USNO)_GPS] = C0', [TAI-UTC(USNO)_GPS] = 37 s + C0'
[UTC-UTC(SU)_GLONASS]= C1', [TAI-UTC(SU)_GLONASS]= 37 s + C1'

For this edition of Circular T, σ0'= 0.9 ns, σ1'= 6.7 ns

2018 0h UTC MJD C0'/ns N0 C1'/ns N1'
JUL 30 58329 -3.4 89 9.9 89
JUL 31 58330 -2.6 89 12.1 89
AUG 1 58331 -3.1 89 14.5 89
AUG 2 58332 -4.0 90 13.6 84
AUG 3 58333 -4.3 89 12.4 76
AUG 4 58334 -4.3 89 11.8 88
AUG 5 58335 -5.0 89 11.3 88
AUG 6 58336 -5.1 90 10.2 89
AUG 7 58337 -3.5 89 11.8 73
AUG 8 58338 -3.9 89 11.5 88
AUG 9 58339 -4.7 89 11.0 85
AUG 10 58340 -5.1 90 13.2 87
AUG 11 58341 -5.0 89 14.2 82
AUG 12 58342 -5.2 88 12.7 88
AUG 13 58343 -4.7 89 10.7 89
AUG 14 58344 -3.7 90 11.5 89
AUG 15 58345 -4.5 88 13.9 85
AUG 16 58346 -5.9 88 12.8 83
AUG 17 58347 -3.9 89 10.8 88
AUG 18 58348 -3.9 90 12.4 81
AUG 19 58349 -4.5 89 11.5 85
AUG 20 58350 -3.4 89 10.4 84
AUG 21 58351 -3.7 89 10.9 89
AUG 22 58352 -3.4 90 11.2 86
AUG 23 58353 -5.0 89 12.3 87
AUG 24 58354 -4.4 89 13.6 81
AUG 25 58355 -2.9 89 12.5 88
AUG 26 58356 -2.1 88 9.8 85
AUG 27 58357 -2.7 89 8.5 82
AUG 28 58358 -4.1 89 7.4 89
AUG 29 58359 -4.3 89 5.6 88

5 - Time links used for the computation of TAI, calibrations information and corresponding uncertainties.

Link Type Equipment Cal_ID1 / Cal_ID2 uStb/ns uCal/ns uAg/ns Al/ns YYMM
AOS /PTB GPSPPP AO_4 /PT02 NA_Al / 1001-2016 0.3 3.9 2.9 -5.3 1808
APL /PTB GPSPPP AP02 /PT02 NA_Al / 1001-2016 0.3 11.2 10.0 24.3 1511
AUS /PTB GPSPPP AU01 /PT02 1002-2010 / 1001-2016 0.3 6.3 3.8
BEV /PTB GPSPPP BE1_ /PT02 1012-2016 / 1001-2016 0.3 2.9 1.5
BIM /PTB NL
BIRM/PTB GPSPPP BI01 /PT02 1015-2016 / 1001-2016 0.4 2.8 1.4
BOM /PTB GPS MC MABM /PT07 2004-2014 / 1001-2016 1.5 8.1 4.1
BY /PTB GPS MC BY46 /PT07 NA / 1001-2016 1.5 12.2 10.0
CAO /PTB GPS MC CA__ /PT07 NC / 1001-2016 1.5 20.0
CNES/PTB GPSPPP CS21 /PT02 1101-2016 / 1001-2016 0.3 4.4 1.6
CNM /PTB GPS MC CN00 /PT07 NA_Al / 1001-2016 2.5 11.2 10.0 -27.3 0804
CNMP/PTB GPS P3 MP1_ /PT02 NA_Al / 1001-2016 0.7 7.3 1.9 41.7 1807
DFNT/PTB GPS P3 DN__ /PT02 NC_Al / 1001-2016 0.7 20.0 10.3 1507
DLR /PTB NL
DMDM/PTB GPSPPP ZM68 /PT02 1011-2016 / 1001-2016 0.3 2.9 1.5
DTAG/PTB GPS P3 DT04 /PT02 1015-2017 / 1001-2016 0.7 2.8 1.4
EIM /PTB GPS MC EI__ /PT07 1011-2007 / 1001-2016 3.0 11.2 10.0
ESTC/PTB GPSPPP ES04 /PT02 1019-2016 / 1001-2016 0.3 2.8 1.4
HKO /PTB GPSPPP HKO2 /PT02 2002-2012 / 1001-2016 0.3 7.7 3.2
ICE /PTB GPS MC CE1_ /PT07 NC / 1001-2016 5.0 20.0
IFAG/PTB GPSPPP IF19 /PT02 1016-2017 / 1001-2016 0.3 5.0 0.6
IGNA/PTB GPS MC IG02 /PT07 NC / 1001-2016 2.5 20.0
IMBH/PTB GPSPPP BH01 /PT02 2004-2016 / 1001-2016 0.3 7.1 1.3
INCP/PTB GPS MC CP__ /PT07 NC / 1001-2016 5.0 20.0
INM /PTB GPS MC IC__ /PT07 NC / 1001-2016 2.0 20.0
INPL/PTB GPSPPP IL05 /PT02 2002-2016 / 1001-2016 0.3 7.1 1.4
INTI/PTB GPS MC IN__ /PT07 NC / 1001-2016 2.5 20.0
INXE/PTB GPSPPP NXRA /PT02 NC / 1001-2016 0.3 20.0
IPQ /PTB GPSPPP IP05 /PT02 NC / 1001-2016 0.4 20.0
JATC/PTB GPS P3 JA01 /PT02 1201-2018 / 1001-2016 0.7 2.8 1.4
JV /PTB GPSPPP JV01 /PT02 NC_Al / 1001-2016 0.3 20.0 130.0 1509
KEBS/PTB NL
KIM /PTB GPS MC KI02 /PT07 NC_Al / 1001-2016 2.0 20.0 -30.6 0901
KRIS/PTB GPSPPP KRG1 /PT02 1017-2017 / 1001-2016 0.3 2.8 1.4
KZ /PTB GPS MC KZ01 /PT07 2002-2008 / 1001-2016 1.5 12.2 10.0
LT /PTB GPS MC LT01 /PT07 1007-2006 / 1001-2016 2.0 11.2 10.0
MASM/PTB GPS P3 MN__ /PT02 NC / 1001-2016 0.7 20.0
MBM /PTB NL
MIKE/PTB GPSPPP MI04 /PT02 1102-2015 / 1001-2016 0.3 4.4 1.9
MKEH/PTB GPS MC MK01 /PT07 NC / 1001-2016 1.5 20.0
MSL /PTB GPS P3 MS0_ /PT02 NC / 1001-2016 1.5 20.0
MTC /PTB GPSPPP MC02 /PT02 NA_Al / 1001-2016 0.3 7.6 2.9 32.6 1503
NAO /PTB GPS MC NAT2 /PT07 NC / 1001-2016 2.0 20.0
NICT/PTB GPSPPP NC4S /PT02 1001-2016 / 1001-2016 0.3 2.4 1.7
NIM /PTB GPSPPP IM06 /PT02 1001-2016 / 1001-2016 0.3 2.2 1.5
NIMB/PTB GPSPPP MB02 /PT02 NA_Al / 1001-2016 0.3 7.3 2.2 32.2 1611
NIMT/PTB GPS MC MTTO /PT07 1013-2017 / 1001-2016 1.5 3.4 2.3
NIS /PTB GPS P3 IS__ /PT02 NC_Al / 1001-2016 1.6 20.0 +16.4 1303
NMIJ/PTB GPSPPP NM0D /PT02 NA_Al / 1001-2016 0.3 3.1 2.6
NMLS/PTB GPS MC LSM1 /PT07 1013-2017 / 1001-2016 1.5 3.4 2.3
NPL /PTB GPSPPP NPL2 /PT02 1014-2017 / 1001-2016 0.3 2.8 1.4
NPLI/PTB GPSPPP LI2P /PT02 2003-2017 / 1001-2016 0.3 7.1 1.4
NRC /PTB GPSPPP NRC4 /PT02 1019-2017 / 1001-2016 0.3 2.6 0.7
NRL /PTB NL
NTSC/PTB GPSPPP NTP1 /PT02 1001-2016 / 1001-2016 0.3 2.3 1.5
ONBA/PTB GPS MC ON__ /PT07 1002-2004 / 1001-2016 2.0 11.2 10.0
ONRJ/PTB GPSPPP RJ01 /PT02 NA_Al / 1001-2016 0.3 7.8 3.5 +5.6 1302
ORB /PTB GPSPPP OR1Z /PT02 1018-2017 / 1001-2016 0.3 2.8 1.4
PL /PTB GPSPPP PL_3 /PT02 NA_Al / 1001-2016 0.3 4.0 2.9 -31.5 1808
SASO/PTB GPSPPP SAS0 /PT02 1020-2017 / 1001-2016 0.4 2.8 1.4
SCL /PTB GPS P3 SC05 /PT07 NC / 1001-2016 1.0 20.0
SG /PTB GPSPPP SG01 /PT02 NA_Al / 1001-2016 0.3 6.5 4.0 -114.2 1802
SIQ /PTB GPSPPP SI01 /PT02 2002-2014 / 1001-2016 0.3 7.4 2.4
SL /PTB GPS P3 SL01 /PT02 NC / 1001-2016 0.7 20.0
SMD /PTB GPSPPP SD01 /PT02 1014-2017 / 1001-2016 0.3 2.8 1.4
SMU /PTB GPS MC SM00 /PT07 NA_Al / 1001-2016 1.5 12.2 10.0 57.8 0908
SU /PTB GPS MC SU19 /PT07 NA_Al / 1001-2016 1.5 8.1 6.3 -7.8 1411
TL /PTB GPSPPP TLT1 /PT02 1001-2016 / 1001-2016 0.3 2.3 1.7
TP /PTB GPSPPP TP04 /PT02 1002-2009 / 1001-2016 0.3 6.6 4.3
UA /PTB GPS MC UA04 /PT07 2003-2011 / 1001-2016 1.5 9.0 5.6
UAE /PTB NL
UME /PTB GPS P3 UM01 /PT02 1011-2016 / 1001-2016 0.7 3.0 1.7
VMI /PTB GPS MC VM__ /PT07 1013-2017 / 1001-2016 3.0 3.4 2.3
ZA /PTB GPSPPP ZA02 /PT02 1102-2016 / 1001-2016 0.3 4.2 1.4
Link Type Equipment Cal_ID uStb/ns uCal/ns uAg/ns Al/ns YYMM
CH /PTB TWGPPP CH01 /PTB05 0284-2012 0.3 1.8 1.5
IT /PTB TWGPPP IT02 /PTB05 0434-2016 0.3 1.2 0.6
NIST/PTB TWGPPP NIST01/PTB05 0393-2015 0.3 1.8 0.9
OP /PTB TWGPPP OP01 /PTB05 0437-2016 0.3 1.2 0.6
ROA /PTB TWGPPP ROA01 /PTB05 0440-2016 0.3 1.5 0.6
SP /PTB TWGPPP SP01 /PTB05 0441-2016 0.3 1.2 0.6
USNO/PTB TWGPPP USNO01/PTB05 0395-2016 0.3 1.1 0.5
VSL /PTB TWGPPP VSL01 /PTB05 0295-2015 0.3 1.3 0.7