CIRCULAR T 386 ISSN 1143-1393
2020 MARCH 09, 16h 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_v0.2.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 2020 0h UTC JAN 31 FEB 5 FEB 10 FEB 15 FEB 20 FEB 25 Uncertainty/ns Notes
MJD 58879 58884 58889 58894 58899 58904 uA uB u
Laboratory k [UTC-UTC(k)]/ns
AOS (Borowiec) 2.8 3.8 4.6 6.6 8.4 10.2 0.5 4.3 4.4
APL (Laurel) 2.7 3.4 2.6 -0.4 -1.1 0.6 0.3 20.0 20.0
AUS (Sydney) -368.0 -378.7 -366.5 -368.5 -355.4 -338.9 0.3 6.6 6.6
BEV (Wien) -28.0 -37.9 -45.1 -51.2 -51.8 -49.7 0.5 3.4 3.5
BFKH (Budapest) 368.6 384.2 401.6 422.0 444.0 463.7 1.5 20.0 20.1
BIM (Sofiya) 12248.4 12266.4 12296.4 12349.3 12390.6 12417.4 0.7 7.1 7.2
BIRM (Beijing) -4.9 -10.7 -3.7 -2.9 -0.6 -4.8 0.3 2.8 2.8
BOM (Skopje) -3142.0 -3164.9 -3185.8 -3205.7 -3217.8 -3240.5 0.3 3.4 3.5 (1)
BY (Minsk) -0.2 -0.2 -0.5 0.0 -0.2 -0.6 1.5 12.2 12.3
CAO (Cagliari) -17308.2 -17416.0 -17517.8 -17620.0 -17727.9 -17834.7 1.5 20.0 20.1
CH (Bern-Wabern) 4.2 2.6 1.8 1.0 0.9 1.1 0.3 2.3 2.3
CNES (Toulouse) 10.5 9.6 8.8 8.7 8.6 8.7 0.3 2.9 2.9
CNM (Queretaro) -1.9 -4.8 -4.8 -2.1 4.1 4.2 2.5 11.2 11.5
CNMP (Panama) -4.2 4.0 16.8 10.9 6.7 10.6 0.7 7.5 7.5
DFNT (Tunis) 17859.9 18078.5 18320.2 18542.0 18747.1 18972.6 0.7 20.0 20.0
DLR (Oberpfaffenhofen) 1336.1 1347.6 1359.8 1369.9 1381.1 1398.7 0.7 3.5 3.6
DMDM (Belgrade) -9.1 -11.9 -16.8 -12.3 -1.3 -12.6 0.3 3.4 3.5
DTAG (Frankfurt/M) 20.8 20.9 17.8 15.3 13.8 15.4 0.3 2.8 2.8
EIM (Thessaloniki) 6.6 -1.3 -2.3 3.8 5.2 0.7 3.0 11.2 11.6
ESTC (Noordwijk) 0.7 0.0 -0.2 -1.6 -2.4 -2.1 0.3 3.2 3.3
HKO (Hong Kong) 211.2 212.6 225.3 233.7 240.1 247.8 0.4 2.9 3.0
ICE (San Jose) 26.2 34.8 42.0 35.0 41.7 54.9 5.0 20.0 20.6
IDN (Serpong-Tangerang) 1736.4 1766.7 1760.5 1791.4 1802.0 1815.9 0.3 2.8 2.8 (2)
IFAG (Wettzell) -907.3 -900.7 -893.0 -898.4 -894.7 -899.2 0.3 3.0 3.0
IGNA (Buenos Aires) -155.1 -169.9 -176.1 -189.8 -211.4 - 2.5 20.0 20.2
IMBH (Sarajevo) 1.5 -0.8 -1.3 0.2 -1.0 -1.2 0.3 2.8 2.8
INCP (Lima) 57.3 44.3 - - - 106.3 5.0 20.0 20.6
INM (Bogota D.C.) -7.5 -9.2 -12.6 -16.4 -18.9 -18.7 2.0 20.0 20.1
INPL (Jerusalem) -8.7 -7.9 -14.0 -13.3 -13.9 -14.8 0.3 7.3 7.3
INTI (Buenos Aires) 40.2 38.5 47.0 38.6 53.9 58.4 2.5 20.0 20.2
INXE (Rio de Janeiro) -3.3 -3.0 -8.5 -4.8 -13.3 -23.7 0.3 20.0 20.0
IPQ (Caparica) 194.9 196.3 200.0 204.4 208.2 213.7 0.7 20.0 20.0
IT (Torino) 0.7 0.0 0.4 1.3 2.8 3.9 0.3 1.1 1.2
JATC (Lintong) 2.0 1.3 1.5 0.1 1.2 1.5 0.3 2.8 2.9
JV (Kjeller) 4.6 19.5 22.2 11.5 3.0 11.0 0.3 4.3 4.3
KRIS (Daejeon) 10.7 10.8 10.3 10.4 11.3 11.2 0.3 3.2 3.2
LRTE (Sao Carlos) 1.0 3.5 14.7 18.9 13.0 17.1 0.3 20.0 20.0
LT (Vilnius) 967.2 966.1 962.2 952.9 953.4 966.4 0.3 2.9 2.9
LUX (Belvaux) -5.5 -9.6 -24.5 -17.2 -12.2 -13.8 0.3 3.0 3.0
MASM (Bayanzurkh) -367.3 -400.2 -429.1 -461.6 -486.1 -511.4 0.7 2.8 2.8
MBM (Podgorica) 269.7 - - - - 387.0 0.7 20.0 20.0
MIKE (Espoo) -6.5 -7.4 -7.1 -6.5 -5.9 -5.2 0.3 2.7 2.7
MSL (Lower Hutt) 28.6 -14.3 -3.7 -1.7 11.2 22.8 1.5 20.0 20.1
NAO (Mizusawa) 185.6 88.9 -5.1 -14.0 -8.5 -5.5 2.0 20.0 20.1
NICT (Tokyo) -0.1 -2.1 -3.1 -4.3 -4.5 -4.9 0.3 1.9 1.9
NIM (Beijing) -0.8 -1.3 -0.6 0.2 0.2 -0.4 0.3 1.8 1.9
NIMB (Bucharest) 8307.1 8352.6 8403.1 8455.8 8501.6 8548.1 0.4 7.6 7.6
NIMT (Pathumthani) - - - - - -
NIS (Cairo) -5.1 3.9 4.8 12.2 10.6 6.6 1.0 20.0 20.0
NIST (Boulder) 1.5 1.8 2.2 2.3 1.5 0.3 0.3 1.9 1.9
NMIJ (Tsukuba) 0.6 1.7 2.1 3.1 -7.7 -5.7 0.3 3.7 3.7
NMLS (Sepang) -1735.6 -1772.9 -1817.4 -1862.7 -1905.8 -1949.0 1.5 4.2 4.5
NPL (Teddington) 4.6 4.0 3.9 4.1 4.3 3.5 0.3 2.7 2.7
NPLI (New-Delhi) 4.0 2.8 2.5 4.3 5.4 5.0 0.3 2.9 2.9
NRC (Ottawa) -25.4 -26.4 -33.1 -32.9 -31.9 -35.3 0.3 3.0 3.0
NRL (Washington DC) 6.2 3.9 3.2 9.7 4.5 2.4 0.3 20.0 20.0
NTSC (Lintong) 1.9 0.7 1.3 -0.2 1.1 1.3 0.3 2.6 2.6
ONBA (Buenos Aires) 290.2 279.4 289.6 301.8 305.1 318.1 2.0 11.2 11.4
ONRJ (Rio de Janeiro) 3.8 2.7 1.2 -1.8 0.7 -2.4 0.7 20.0 20.0
OP (Paris) 1.3 1.0 1.0 0.4 0.0 0.0 0.3 1.1 1.2 (3)
ORB (Bruxelles) -0.9 -1.7 -2.5 -3.2 -3.0 -2.5 0.3 3.2 3.2
PL (Warszawa) 7.4 7.7 9.3 10.6 12.4 14.5 0.3 2.8 2.9
PTB (Braunschweig) 1.7 1.4 1.3 1.2 1.1 1.1 0.1 0.6 0.6
ROA (San Fernando) -3.1 -4.1 -3.7 -3.1 -3.5 -5.1 0.3 1.1 1.2
SASO (Riyadh) -1083.6 -1107.4 -1120.0 -1133.2 -1138.6 -1145.1 0.5 3.0 3.1
SCL (Hong Kong) 37.5 36.9 29.2 28.3 29.6 37.5 1.0 3.0 3.1
SG (Singapore) 10.3 1.8 -2.7 -3.4 -0.3 5.8 0.3 2.8 2.8
SIQ (Ljubljana) 147.2 142.9 140.6 160.1 170.1 188.9 0.3 7.6 7.6
SL (Colombo) 91.3 94.6 90.5 90.0 90.4 101.9 0.3 2.8 2.8
SMD (Bruxelles) -4.2 -10.6 -5.7 -9.3 -8.3 -12.9 0.3 3.2 3.3
SMU (Bratislava) -110.2 -115.9 -117.2 -120.5 -115.1 - 1.5 12.2 12.3
SP (Boras) 3.0 3.8 4.4 4.7 5.1 4.7 0.3 1.1 1.1
SU (Moskva) 2.0 1.9 1.5 1.6 1.2 1.3 0.7 1.9 2.0
TL (Chung-Li) 5.9 5.8 5.6 5.9 6.2 5.8 0.3 2.0 2.0
TP (Praha) 18.2 11.1 10.5 9.6 9.2 11.3 0.3 2.7 2.8
UA (Kharkov) 4.2 -6.0 -7.8 -7.9 -9.5 -11.4 1.5 9.4 9.5
UAE (Abu Dhabi) 14.7 10.1 -2.3 0.9 12.7 13.5 4.0 8.8 9.7
UME (Gebze-Kocaeli) 61.9 61.1 55.6 66.2 68.3 71.6 0.3 3.5 3.6 (4)
USNO (Washington DC) -0.4 -0.6 -0.7 -0.4 -0.5 -0.3 0.2 1.2 1.2
VMI (Ha Noi) 25.6 4.7 -19.4 -48.4 -29.4 27.7 2.5 7.1 7.5
VSL (Delft) -2.6 -6.8 -1.3 -3.1 -1.9 -7.2 0.3 1.7 1.7
ZA (Pretoria) 9.0 9.1 8.0 5.6 2.0 0.1 0.3 2.7 2.7
- Notes on section 1:
(1) BOM : Apparent time step of UTC(BOM) of +4 ns between MJD 58879 and 58884 due to calibration.
(2) IDN : Apparent time step of UTC(IDN) of +4 ns between MJD 58879 and 58884 due to change of coordinates.
(3) UTC(OP)-UTC(PTB) linked by TWSTFT with Software-Defined Radio (SDR) receiver.
(4) UME : Time step of UTC(UME) of -9 ns on 58891.3 due to change of master clock.

2 - Difference between the normalized frequencies of EAL and TAI.
Interval of validity f(EAL)-f(TAI)
Steering correction 58879 - 58904 6.493x10-13 (2020 JAN 31 - 2020 FEB 25)
New correction 58904 - 58939 6.493x10-13 (2020 FEB 25 - 2020 MAR 31)
New correction foreseen 58939 - 58969 6.493x10-13 (2020 MAR 31 - 2020 APR 30)

3 - Duration of the TAI scale interval d.

Table 1: Estimate of d by individual PSFS measurements and corresponding uncertainty.
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 58879 58904 -7.22 8.00 8.00 0.00 0.08 11.31 PFS/NA T148 8. Y (1)
PTB-CS2 58879 58904 -1.71 5.00 12.00 0.00 0.08 13.00 PFS/NA T148 12. Y (1)
NIM5 58819 58849 -0.58 0.20 0.90 0.20 0.20 0.96 PFS/NA T340 1.40 Y (2)
NIM5 58879 58899 -1.46 0.20 0.90 0.20 0.28 0.98 PFS/NA T340 1.40 Y (3)
SYRTE-FO1 58879 58904 -0.72 0.15 0.32 0.09 0.23 0.43 PFS/NA T301 0.37 Y (4)
SYRTE-FO2 58884 58899 -0.36 0.30 0.22 0.07 0.37 0.53 PFS/NA T301 0.23 Y (4)
SYRTE-FOM 58879 58904 0.12 0.60 0.67 0.09 0.23 0.93 PFS/NA T372 0.70 Y (4)
SYRTE-FORb 58879 58904 -0.50 0.21 0.25 0.06 0.23 0.40 0.6 [1] T328 0.34 Y (4)
PTB-CSF2 58874 58904 -0.55 0.11 0.17 0.01 0.07 0.21 PFS/NA T370 0.17 Y (5)
SU-CsFO2 58879 58904 -0.01 0.25 0.22 0.10 0.54 0.64 PFS/NA T315 0.50 Y (6)

Notes:
(1) Continuously operating as a clock participating to TAI
(2) Report 13 FEB. 2020 by NIM
(3) Report 05 MAR. 2020 by NIM
(4) Report 03 MAR. 2020 by LNE-SYRTE
(5) Report 04 MAR. 2020 by PTB
(6) Report 02 MAR. 2020 by SU
[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 MJD58519-58904, and corresponding uncertainties.

Period of estimation d u
58879-58904 -0.51x10-15 0.18x10-15 (2020 JAN 31 - 2020 FEB 25)

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'= 0.8 ns, σ1'= 6.3 ns

2020 0h UTC MJD C0'/ns N0 C1'/ns N1'
JAN 31 58879 2.5 89 27.8 88
FEB 1 58880 2.6 89 27.9 89
FEB 2 58881 3.5 89 27.8 89
FEB 3 58882 2.0 90 28.1 90
FEB 4 58883 1.8 89 27.4 89
FEB 5 58884 2.9 89 27.2 83
FEB 6 58885 1.7 89 27.4 77
FEB 7 58886 0.3 90 27.1 88
FEB 8 58887 1.4 89 26.8 89
FEB 9 58888 3.1 89 26.7 88
FEB 10 58889 2.9 89 25.8 89
FEB 11 58890 1.7 90 25.0 90
FEB 12 58891 0.4 89 25.4 86
FEB 13 58892 1.2 89 26.8 89
FEB 14 58893 2.4 89 27.2 89
FEB 15 58894 2.5 90 26.1 90
FEB 16 58895 3.1 89 26.3 87
FEB 17 58896 2.5 89 27.0 88
FEB 18 58897 2.9 89 27.6 89
FEB 19 58898 2.4 90 26.6 89
FEB 20 58899 0.9 89 26.1 70
FEB 21 58900 2.3 84 27.3 88
FEB 22 58901 4.0 89 27.4 88
FEB 23 58902 3.4 90 26.8 89
FEB 24 58903 2.8 89 27.0 76
FEB 25 58904 2.8 89 27.5 64

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 /PT09 NA_Al / 1001-2018 0.5 4.3 3.5 -5.3 1808
APL /PTB GPSPPP AP02 /PT09 NC / 1001-2018 0.3 20.0
AUS /PTB GPSPPP AU01 /PT09 1002-2010 / 1001-2018 0.3 6.6 4.3
BEV /PTB GPSPPP BE1_ /PT09 1012-2016 / 1001-2018 0.5 3.4 2.3
BFKH/PTB GPS MC MK01 /PT09 NC / 1001-2018 1.5 20.0
BIM /PTB GPSPPP BM51 /PT09 2007-2019 / 1001-2018 0.7 7.1 0.9
BIRM/PTB GPSPPP BI41 /PT09 1016-2018 / 1001-2018 0.3 2.7 0.9
BOM /PTB GPSPPP MABM /PT09 1011-2016 / 1001-2018 0.3 3.4 2.4
BY /PTB GPS MC BY46 /PT09 2001-2008 / 1001-2018 1.5 12.2 10.0
CAO /PTB GPS MC CA__ /PT09 NC / 1001-2018 1.5 20.0
CNES/PTB GPSPPP CS21 /PT09 1015-2018 / 1001-2018 0.3 2.8 1.2
CNM /PTB GPS MC CN00 /PT09 NA_Al / 1001-2018 2.5 11.2 10.0 -27.3 0804
CNMP/PTB GPS P3 MP1_ /PT09 NA_Al / 1001-2018 0.7 7.5 2.6 41.7 1807
DFNT/PTB GPS P3 DN__ /PT09 NC_Al / 1001-2018 0.7 20.0 10.3 1507
DLR /PTB GPS P3 DL05 /PT09 1012-2016 / 1001-2018 0.7 3.5 2.4
DMDM/PTB GPSPPP ZM68 /PT09 1011-2016 / 1001-2018 0.3 3.4 2.4
DTAG/PTB GPSPPP DT05 /PT09 1012-2019 / 1001-2018 0.3 2.7 0.9
EIM /PTB GPS MC EI__ /PT09 NA / 3.0 11.2 10.0
ESTC/PTB GPSPPP ES04 /PT09 1019-2016 / 1001-2018 0.3 3.2 2.0
HKO /PTB GPSPPP HKO2 /PT09 1011-2018 / 1001-2018 0.4 2.9 1.4
ICE /PTB GPS MC CE1_ /PT09 NC / 1001-2018 5.0 20.0
IDN /PTB GPSPPP KI01 /PT09 1017-2018 / 1001-2018 0.3 2.7 0.9
IFAG/PTB GPSPPP IF19 /PT09 1016-2017 / 1001-2018 0.3 3.0 1.7
IGNA/PTB GPS MC IG02 /PT09 NC / 1001-2018 2.5 20.0
IMBH/PTB GPSPPP BH02 /PT09 1011-2019 / 1001-2018 0.3 2.7 0.9
INCP/PTB GPS MC CP__ /PT09 NC / 1001-2018 5.0 20.0
INM /PTB GPS MC IC__ /PT09 NC / 1001-2018 2.0 20.0
INPL/PTB GPSPPP IL06 /PT09 2003-2016 / 1001-2018 0.3 7.3 2.2
INTI/PTB GPS MC IN__ /PT09 NC / 1001-2018 2.5 20.0
INXE/PTB GPSPPP NXRA /PT09 NC / 1001-2018 0.3 20.0
IPQ /PTB GPS P3 IP05 /PT09 NC / 1001-2018 0.7 20.0
JATC/PTB GPSPPP JA01 /PT09 1201-2018 / 1001-2018 0.3 2.8 1.2
JV /PTB GPSPPP JV02 /PT09 1101-2017 / 1001-2018 0.3 4.3 1.5
KRIS/PTB GPSPPP KRG1 /PT09 1017-2017 / 1001-2018 0.3 3.2 1.9
LRTE/PTB GPSPPP LRRC /PT09 NC / 1001-2018 0.3 20.0
LT /PTB GPSPPP LT02 /PT09 1014-2018 / 1001-2018 0.3 2.8 1.2
LUX /PTB GPSPPP LU01 /PT09 1012-2018 / 1001-2018 0.3 2.9 1.5
MASM/PTB GPS P3 MN__ /PT09 1019-2018 / 1001-2018 0.7 2.7 1.0
MBM /PTB GPS P3 ME01 /PT09 NC / 1001-2018 0.7 20.0
MIKE/PTB GPSPPP MI04 /PT09 1016-2019 / 1001-2018 0.3 2.7 0.9
MSL /PTB GPS P3 MS0_ /PT09 NC / 1001-2018 1.5 20.0
NAO /PTB GPS MC NAT2 /PT09 NC / 1001-2018 2.0 20.0
NICT/PTB GPSPPP NC4S /PT09 1001-2018 / 1001-2018 0.3 1.9 1.2
NIM /PTB GPSPPP IM06 /PT09 1001-2018 / 1001-2018 0.3 1.9 1.1
NIMB/PTB GPSPPP MB02 /PT09 NA_Al / 1001-2018 0.4 7.6 2.9 32.2 1611
NIMT/PTB NL
NIS /PTB GPS P3 IS__ /PT09 NC_Al / 1001-2018 1.0 20.0 +16.4 1303
NMIJ/PTB GPSPPP NM0D /PT09 1001-2014 / 1001-2018 0.3 3.7 3.2
NMLS/PTB GPS MC LSM1 /PT09 1013-2017 / 1001-2018 1.5 4.2 3.2
NPL /PTB GPSPPP NPL1 /PT09 1015-2019 / 1001-2018 0.3 2.7 0.9
NPLI/PTB GPSPPP LI2P /PT09 1013-2018 / 1001-2018 0.3 2.9 1.4
NRC /PTB GPSPPP NRC4 /PT09 1019-2017 / 1001-2018 0.3 3.0 1.7
NRL /PTB GPSPPP RL2_ /PT09 NC / 1001-2018 0.3 20.0
NTSC/PTB GPSPPP NTP1 /PT09 1001-2016 / 1001-2018 0.3 2.7 2.3
ONBA/PTB GPS MC ON__ /PT09 1002-2004 / 1001-2018 2.0 11.2 10.0
ONRJ/PTB GPS P3 RJ03 /PT09 NC_Al / 1001-2018 0.7 20.0 -11.7 1912
ORB /PTB GPSPPP OR1Z /PT09 1018-2017 / 1001-2018 0.3 3.2 2.0
PL /PTB GPSPPP PL_3 /PT09 1014-2018 / 1001-2018 0.3 2.8 1.2
SASO/PTB GPSPPP SAS0 /PT09 1020-2017 / 1001-2018 0.5 3.0 1.6
SCL /PTB GPS P3 SC05 /PT09 1011-2018 / 1001-2018 1.0 2.9 1.4
SG /PTB GPSPPP SG02 /PT09 1019-2018 / 1001-2018 0.3 2.7 0.9
SIQ /PTB GPSPPP SI01 /PT09 2002-2014 / 1001-2018 0.3 7.6 3.0
SL /PTB GPSPPP SL01 /PT09 1017-2018 / 1001-2018 0.3 2.7 0.9
SMD /PTB GPSPPP SD01 /PT09 1014-2017 / 1001-2018 0.3 3.2 1.9
SMU /PTB GPS MC SM00 /PT09 NA_Al / 1001-2018 1.5 12.2 10.0 57.8 0908
SU /PTB GPS P3 SU31 /PT09 1001-2018 / 1001-2018 0.8 2.0 1.3
TL /PTB GPSPPP TLT1 /PT09 1001-2018 / 1001-2018 0.3 2.0 1.4
TP /PTB GPSPPP TP02 /PT09 1015-2019 / 1001-2018 0.3 2.7 0.9
UA /PTB GPS MC UA04 /PT09 2003-2011 / 1001-2018 1.5 9.4 6.3
UAE /PTB GPS MC AE__ /PT09 2001-2016 / 1001-2018 4.0 8.8 5.4
UME /PTB GPSPPP UM01 /PT09 1011-2016 / 1001-2018 0.3 3.5 2.4
VMI /PTB GPS P3 VM02 /PT09 2001-2019 / 1001-2018 2.5 7.1 0.9
ZA /PTB GPSPPP ZA02 /PT09 1018-2018 / 1001-2018 0.3 2.7 1.0
Link Type Equipment Cal_ID uStb/ns uCal/ns uAg/ns Al/ns YYMM
CH /PTB TWGPPP CH01 /PTB05 0284-2012 0.3 2.2 1.8
IT /PTB TWGPPP IT02 /PTB05 0502-2019 0.3 1.0 0.0
NIST/PTB TWGPPP NIST01/PTB05 0393-2015 0.3 1.9 1.3
OP /PTB TWSDRR OP51 /PTB55 0517-2020 0.3 1.0 0.0
ROA /PTB TWGPPP ROA01 /PTB05 0504-2019 0.3 1.0 0.0
SP /PTB TWGPPP SP01 /PTB05 0496-2019 0.3 1.0 0.0
USNO/PTB TWGPPP USNO01/PTB05 0395-2016 0.3 1.5 0.9
VSL /PTB TWGPPP VSL01 /PTB05 0295-2015 0.3 1.6 1.0