CIRCULAR T 370 ISSN 1143-1393
2018 NOVEMBER 08, 14h 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 SEP 28 OCT 3 OCT 8 OCT 13 OCT 18 OCT 23 OCT 28 Uncertainty/ns Notes
MJD 58389 58394 58399 58404 58409 58414 58419 uA uB u
Laboratory k [UTC-UTC(k)]/ns
AOS (Borowiec) -6.1 -6.4 -6.1 -6.2 -6.4 -6.8 -6.8 0.4 4.1 4.1
APL (Laurel) 1.0 1.0 1.2 1.1 -5.0 -6.5 0.9 0.4 11.3 11.3 (1)
AUS (Sydney) -47.0 -40.1 -25.1 -24.6 -25.7 -28.9 -28.8 0.4 6.4 6.4
BEV (Wien) 18.6 18.7 18.3 17.0 14.9 13.5 18.0 0.4 3.2 3.2
BIM (Sofiya) - - - - - - -
BIRM (Beijing) 15.0 12.9 12.9 14.1 12.0 8.0 7.6 0.5 3.1 3.2
BOM (Skopje) -821.1 -855.4 -885.9 -907.3 -936.4 -958.3 -977.1 1.5 8.2 8.3
BY (Minsk) -3.0 -3.4 -3.6 -2.0 -2.5 -2.2 -1.1 1.5 12.2 12.3
CAO (Cagliari) -6944.9 -7045.6 -7148.4 -7252.2 -7356.4 -7456.2 -7562.0 1.5 20.0 20.1
CH (Bern-Wabern) -5.4 -5.6 -5.7 -4.9 -4.3 -4.8 -4.0 0.4 2.2 2.3
CNES (Toulouse) 22.3 20.7 13.9 15.9 15.3 16.8 13.4 0.4 4.6 4.6
CNM (Queretaro) -2.2 -7.3 -5.1 0.4 1.3 0.3 -0.2 2.5 11.2 11.5
CNMP (Panama) -7.5 -3.6 -7.8 7.2 -15.2 -15.9 -7.2 0.7 7.4 7.4
DFNT (Tunis) 1694.9 192.6 377.2 595.6 785.8 979.6 1187.3 0.7 20.0 20.0 (2)
DLR (Oberpfaffenhofen) - - - - - - -
DMDM (Belgrade) 17.9 21.7 25.5 20.7 10.8 9.6 5.4 0.4 3.2 3.3
DTAG (Frankfurt/M) -110.3 -112.4 -119.2 -125.4 -135.3 -145.1 -150.2 0.4 2.9 3.0
EIM (Thessaloniki) 2.9 0.4 6.4 5.7 3.0 6.9 5.1 3.0 11.3 11.7
ESTC (Noordwijk) -1.0 -2.0 -0.6 0.1 -1.4 -1.3 -0.4 0.4 3.1 3.1
HKO (Hong Kong) 352.2 373.0 393.3 411.0 431.3 458.1 472.5 0.4 7.8 7.8
ICE (San Jose) -16.7 -14.3 -7.2 -3.7 0.1 6.3 -2.2 5.0 20.0 20.7
IFAG (Wettzell) -939.1 -920.3 -896.7 -883.1 -877.1 -870.8 -871.7 0.4 5.2 5.2
IGNA (Buenos Aires) 7.5 4.1 7.9 4.4 3.8 11.5 8.8 2.5 20.0 20.2
IMBH (Sarajevo) -0.1 -0.3 3.8 -4.2 -0.1 5.1 -0.8 0.4 7.2 7.2
INCP (Lima) -19.2 -25.4 -27.3 -28.6 -57.9 -54.0 -74.5 5.0 20.0 20.7
INM (Bogota D.C.) -14.1 -8.4 -6.5 -8.3 -8.8 -11.3 -12.6 2.0 20.0 20.1
INPL (Jerusalem) -520.1 -551.7 -575.4 0.1 -29.0 -52.1 -81.5 0.4 7.3 7.3 (3)
INTI (Buenos Aires) -45.5 -56.6 -43.6 -50.6 -57.8 -48.7 -47.4 2.5 20.0 20.2
INXE (Rio de Janeiro) 0.9 -12.7 -14.5 -7.3 2.1 -17.9 -14.8 0.4 20.0 20.0
IPQ (Caparica) 5.4 14.0 20.1 14.1 25.0 34.9 44.1 0.5 20.0 20.0
IT (Torino) 3.6 3.4 3.7 3.9 1.5 0.9 2.2 0.4 1.7 1.7
JATC (Lintong) 0.7 2.9 3.5 4.2 3.7 4.8 2.1 0.7 2.8 2.9
JV (Kjeller) 27.5 13.8 4.1 -0.7 -10.6 -17.7 -22.4 0.4 20.0 20.0
KEBS (Nairobi) - - - - - - -
KIM (Serpong-Tangerang) 735.1 748.7 737.6 778.7 786.7 796.4 803.5 2.0 20.0 20.1
KRIS (Daejeon) -3.4 -4.6 -5.9 -7.5 -8.9 -10.5 -11.9 0.4 3.1 3.1
KZ (Astana) -157.6 -118.4 -102.9 -98.5 -62.9 -36.3 -47.5 1.5 12.3 12.4
LT (Vilnius) 392.2 405.6 406.9 425.7 417.4 453.6 449.0 2.0 11.3 11.4
MASM (Bayanzurkh) -81.4 -107.8 -129.7 -161.6 -186.2 -224.3 -255.4 0.7 20.0 20.0
MBM (Podgorica) - - - - - - -
MIKE (Espoo) -10.3 -11.3 -10.5 -8.2 -3.8 1.0 5.0 0.4 4.6 4.6
MKEH (Budapest) -1279.1 -1508.4 -1709.2 -1925.3 -2143.0 -2362.2 -2585.6 1.5 20.0 20.1
MSL (Lower Hutt) 516.5 487.6 489.4 467.0 500.2 503.1 483.3 1.5 20.0 20.1
MTC (Makkah) - - - - - - -
NAO (Mizusawa) -210.3 -217.7 -220.2 -227.5 -234.0 -240.2 -248.9 2.0 20.0 20.1
NICT (Tokyo) 9.6 11.6 13.9 12.1 9.2 7.8 7.3 0.4 2.5 2.5
NIM (Beijing) 3.6 4.1 4.1 3.3 2.1 1.6 1.6 0.4 2.4 2.4
NIMB (Bucharest) 3493.4 3544.6 3596.4 3643.4 3689.6 3734.8 3780.6 0.5 7.5 7.5
NIMT (Pathumthani) -335.7 -333.7 -337.7 -331.7 -336.5 -340.6 -340.7 1.5 3.7 4.0
NIS (Cairo) -10.6 -22.0 -22.1 -26.0 -16.6 -8.0 - 1.6 20.0 20.1
NIST (Boulder) 0.5 -0.1 -1.3 -1.1 -0.6 -0.1 0.1 0.4 2.1 2.1
NMIJ (Tsukuba) 6.1 5.7 5.0 4.6 3.8 4.0 3.5 0.4 3.3 3.4
NMLS (Sepang) -2204.8 -2243.2 -2272.0 -2308.2 -2342.7 -2378.3 -2415.0 1.5 3.7 4.0
NPL (Teddington) 1.3 0.9 0.7 0.4 0.3 0.9 0.5 0.4 3.1 3.1
NPLI (New-Delhi) 15.5 4.5 -0.5 -2.8 -4.3 -3.6 0.4 0.4 2.8 2.8 (4)
NRC (Ottawa) -8.1 0.9 -8.4 -7.5 -9.8 -13.9 -13.2 0.4 2.8 2.9
NRL (Washington DC) - - - - - - -
NTSC (Lintong) -2.1 -1.4 0.6 2.0 -0.4 -0.1 -2.6 0.4 2.5 2.5
ONBA (Buenos Aires) -2120.3 -2120.1 -2137.3 -2138.7 -2128.4 -2147.5 -2161.8 2.0 11.3 11.4
ONRJ (Rio de Janeiro) -2.2 -5.7 -14.0 -5.2 4.9 -9.6 4.4 0.4 7.9 7.9
OP (Paris) 2.6 2.4 2.3 2.1 1.9 1.8 1.5 0.4 1.7 1.7
ORB (Bruxelles) 0.6 0.4 1.2 0.4 -0.4 -0.6 -0.7 0.4 3.1 3.1
PL (Warszawa) 5.7 6.0 6.6 7.6 9.0 11.6 14.3 0.4 3.1 3.1
PTB (Braunschweig) -1.8 -1.8 -2.1 -2.0 -2.2 -2.5 -2.5 0.2 1.2 1.2
ROA (San Fernando) -4.4 -4.4 -4.7 -4.7 -4.6 -5.8 -5.9 0.4 1.9 2.0
SASO (Riyadh) -1196.8 -1205.3 -1212.5 -1222.7 -1240.8 -1249.6 -1254.5 0.5 3.1 3.2
SCL (Hong Kong) 87.1 62.5 49.7 60.9 68.6 78.8 - 1.0 20.0 20.1
SG (Singapore) 0.3 4.9 12.8 23.9 35.0 39.9 31.9 0.4 6.6 6.6
SIQ (Ljubljana) 360.1 360.2 375.6 388.0 390.0 350.0 344.2 0.4 7.5 7.5
SL (Colombo) -16.5 -23.9 -30.5 -49.3 -51.4 -44.8 -49.1 0.7 20.0 20.0
SMD (Bruxelles) -8.5 -12.4 0.4 0.2 -5.3 5.8 10.7 0.4 3.1 3.2
SMU (Bratislava) -1960.9 -1960.4 -1972.6 -1972.9 -1976.3 -1976.4 -1934.1 1.5 12.3 12.4
SP (Boras) 0.3 -1.3 -4.6 -4.7 -4.6 -3.9 -3.1 0.4 1.6 1.7
SU (Moskva) -0.6 -1.2 -1.8 -1.7 -1.8 -2.3 -2.6 1.3 7.0 7.1
TL (Chung-Li) -1.2 -1.3 -2.1 -2.4 -2.6 -2.6 -2.7 0.4 2.6 2.6
TP (Praha) -34.2 -22.2 -19.2 -13.1 -7.0 -0.8 -5.0 0.4 6.7 6.7
UA (Kharkov) 5.9 -8.6 -9.6 -15.1 -8.7 4.6 8.0 1.5 9.0 9.2
UAE (Abu Dhabi) - - - - - - -
UME (Gebze-Kocaeli) -470.6 -442.8 -443.6 -465.2 -466.2 -452.7 -443.0 0.7 3.3 3.4
USNO (Washington DC) 0.1 0.2 -0.1 -1.0 -0.9 -0.7 -0.2 0.3 1.5 1.5
VMI (Ha Noi) -22.4 -22.8 -13.1 -8.9 -7.0 -2.7 -5.2 3.0 3.7 4.8
VSL (Delft) -4.4 -13.5 -15.1 -20.6 -10.6 7.2 11.3 0.4 1.8 1.8
ZA (Pretoria) -2.6 -4.2 -3.3 -1.4 1.3 2.7 4.1 0.4 4.4 4.4
- Notes on section 1:
(1) APL : Apparent time step of UTC(APL) of about +6 ns on 58409
and about -7.9 ns on 58417
(2) DFNT : Apparent time step of UTC(DFNT) of about +1700 ns near 58392.6
(3) INPL : Time step of UTC(INPL) of -600 ns on 58399.29
(4) NPLI : Time step of UTC(NPLI) of about +9.4 ns on 58391 due to calibration

2 - Difference between the normalized frequencies of EAL and TAI.
Interval of validity f(EAL)-f(TAI)
Steering correction 58389 - 58419 6.501x10-13 (2018 SEP 28 - 2018 OCT 28)
New correction 58419 - 58449 6.501x10-13 (2018 OCT 28 - 2018 NOV 27)
New correction foreseen 58449 - 58479 6.501x10-13 (2018 NOV 27 - 2018 DEC 27)

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 58389 58419 5.06 8.00 8.00 0.00 0.13 11.31 PFS/NA T148 8. Y (1)
PTB-CS2 58389 58419 -6.59 5.00 12.00 0.00 0.13 13.00 PFS/NA T148 12. Y (1)
PTB-CSF2 58389 58419 0.26 0.20 0.20 0.07 0.13 0.32 PFS/NA [1] 0.17 Y (2)
SYRTE-FO1 58389 58419 0.32 0.20 0.32 0.06 0.26 0.46 PFS/NA T301 0.37 Y (3)
SYRTE-FO2 58389 58419 0.40 0.20 0.20 0.05 0.26 0.39 PFS/NA T301 0.23 Y (3)
SYRTE-FORb 58389 58419 0.57 0.20 0.25 0.06 0.26 0.42 0.6 [2] T328 0.34 Y (3)

Notes:
(1) Continuously operating as a clock participating to TAI
(2) Report 01 NOV. 2018 by PTB
(3) Report 02 NOV. 2018 by LNE-SYRTE
[1] Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks.
Weyers S., Gerginov V., Kazda M., Rahm J., Lipphardt B., Dobrev G. and Gibble K. Metrologia 55, 789, 2018.
[2] 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 MJD58029-58419, and corresponding uncertainties.

Period of estimation d u
58389-58419 0.36x10-15 0.20x10-15 (2018 SEP 28 - 2018 OCT 28)

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'= 0.7 ns, σ1'= 6.5 ns

2018 0h UTC MJD C0'/ns N0 C1'/ns N1'
SEP 28 58389 -3.6 89 9.8 83
SEP 29 58390 -3.7 89 9.4 87
SEP 30 58391 -3.0 89 10.3 88
OCT 1 58392 -1.4 44 11.7 87
OCT 2 58393 -2.0 45 10.7 83
OCT 3 58394 -2.7 87 9.4 86
OCT 4 58395 -2.5 89 9.9 89
OCT 5 58396 -2.4 90 10.0 88
OCT 6 58397 -2.8 89 5.8 57
OCT 7 58398 -3.9 89 - 0
OCT 8 58399 -3.8 89 5.3 12
OCT 9 58400 -3.9 90 8.1 89
OCT 10 58401 -4.9 88 8.9 85
OCT 11 58402 -3.8 89 8.0 85
OCT 12 58403 -3.5 89 6.6 86
OCT 13 58404 -4.7 90 4.8 85
OCT 14 58405 -4.6 89 4.6 86
OCT 15 58406 -2.1 89 4.8 89
OCT 16 58407 -3.0 89 3.1 89
OCT 17 58408 -4.6 83 1.8 89
OCT 18 58409 -4.0 89 1.9 86
OCT 19 58410 -3.0 89 4.4 86
OCT 20 58411 -2.7 89 5.2 87
OCT 21 58412 -1.8 90 3.0 87
OCT 22 58413 -1.5 89 3.2 84
OCT 23 58414 -2.4 89 4.8 89
OCT 24 58415 -3.0 89 3.8 89
OCT 25 58416 -3.1 90 4.6 86
OCT 26 58417 -2.2 89 10.1 84
OCT 27 58418 -3.1 89 9.5 80
OCT 28 58419 -3.6 89 4.5 86

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 3.0 -5.3 1808
APL /PTB GPSPPP AP02 /PT02 NA_Al / 1001-2016 0.3 11.2 10.0
AUS /PTB GPSPPP AU01 /PT02 1002-2010 / 1001-2016 0.3 6.3 3.9
BEV /PTB GPSPPP BE1_ /PT02 1012-2016 / 1001-2016 0.3 3.0 1.6
BIM /PTB NL
BIRM/PTB GPSPPP BI01 /PT02 1015-2016 / 1001-2016 0.4 2.9 1.5
BOM /PTB GPS MC MABM /PT10 2004-2014 / 1001-2016 1.5 8.1 4.2
BY /PTB GPS MC BY46 /PT10 NA / 1001-2016 1.5 12.2 10.0
CAO /PTB GPS MC CA__ /PT10 NC / 1001-2016 1.5 20.0
CNES/PTB GPSPPP CS21 /PT02 1101-2016 / 1001-2016 0.3 4.4 1.7
CNM /PTB GPS MC CN00 /PT10 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 2.0 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 3.0 1.6
DTAG/PTB GPSPPP DT05 /PT02 1015-2017 / 1001-2016 0.3 2.7 1.0
EIM /PTB GPS MC EI__ /PT10 1011-2007 / 1001-2016 3.0 11.2 10.0
ESTC/PTB GPSPPP ES04 /PT02 1019-2016 / 1001-2016 0.3 2.9 1.5
HKO /PTB GPSPPP HKO2 /PT02 2002-2012 / 1001-2016 0.3 7.7 3.3
ICE /PTB GPS MC CE1_ /PT10 NC / 1001-2016 5.0 20.0
IFAG/PTB GPSPPP IF19 /PT02 1016-2017 / 1001-2016 0.3 5.1 0.8
IGNA/PTB GPS MC IG02 /PT10 NC / 1001-2016 2.5 20.0
IMBH/PTB GPSPPP BH01 /PT02 2004-2016 / 1001-2016 0.3 7.1 1.4
INCP/PTB GPS MC CP__ /PT10 NC / 1001-2016 5.0 20.0
INM /PTB GPS MC IC__ /PT10 NC / 1001-2016 2.0 20.0
INPL/PTB GPSPPP IL05 /PT02 2002-2016 / 1001-2016 0.3 7.2 1.5
INTI/PTB GPS MC IN__ /PT10 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 2.5 0.0
JV /PTB GPSPPP JV01 /PT02 NC_Al / 1001-2016 0.3 20.0 130.0 1509
KEBS/PTB NL
KIM /PTB GPS MC KI02 /PT10 NC_Al / 1001-2016 2.0 20.0 -30.6 0901
KRIS/PTB GPSPPP KRG1 /PT02 1017-2017 / 1001-2016 0.3 2.9 1.5
KZ /PTB GPS MC KZ01 /PT10 2002-2008 / 1001-2016 1.5 12.2 10.0
LT /PTB GPS MC LT01 /PT10 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 4.5 2.0
MKEH/PTB GPS MC MK01 /PT10 NC / 1001-2016 1.5 20.0
MSL /PTB GPS P3 MS0_ /PT02 NC / 1001-2016 1.5 20.0
MTC /PTB NL
NAO /PTB GPS MC NAT2 /PT10 NC / 1001-2016 2.0 20.0
NICT/PTB GPSPPP NC4S /PT02 1001-2016 / 1001-2016 0.3 2.4 1.8
NIM /PTB GPSPPP IM06 /PT02 1001-2016 / 1001-2016 0.3 2.2 1.6
NIMB/PTB GPSPPP MB02 /PT02 NA_Al / 1001-2016 0.4 7.4 2.3 32.2 1611
NIMT/PTB GPS MC MTTO /PT10 1013-2017 / 1001-2016 1.5 3.5 2.5
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 3.2 2.7
NMLS/PTB GPS MC LSM1 /PT10 1013-2017 / 1001-2016 1.5 3.5 2.5
NPL /PTB GPSPPP NPL2 /PT02 1014-2017 / 1001-2016 0.3 2.9 1.5
NPLI/PTB GPSPPP LI2P /PT02 1013-2018 / 1001-2016 0.3 2.5 0.3
NRC /PTB GPSPPP NRC4 /PT02 1019-2017 / 1001-2016 0.3 2.6 0.8
NRL /PTB NL
NTSC/PTB GPSPPP NTP1 /PT02 1001-2016 / 1001-2016 0.3 2.3 1.6
ONBA/PTB GPS MC ON__ /PT10 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 2.9 1.5
PL /PTB GPSPPP PL_3 /PT02 1014-2018 / 1001-2016 0.3 2.9 1.5
SASO/PTB GPSPPP SAS0 /PT02 1020-2017 / 1001-2016 0.4 2.9 1.5
SCL /PTB GPS P3 SC05 /PT10 NC / 1001-2016 1.0 20.0
SG /PTB GPSPPP SG01 /PT02 NA_Al / 1001-2016 0.3 6.5 4.1 -114.2 1802
SIQ /PTB GPSPPP SI01 /PT02 2002-2014 / 1001-2016 0.3 7.4 2.5
SL /PTB GPS P3 SL01 /PT02 NC / 1001-2016 0.7 20.0
SMD /PTB GPSPPP SD01 /PT02 1014-2017 / 1001-2016 0.3 2.9 1.5
SMU /PTB GPS MC SM00 /PT10 NA_Al / 1001-2016 1.5 12.2 10.0 57.8 0908
SU /PTB GPS MC SU19 /PT10 NA_Al / 1001-2016 1.5 8.1 6.4 -7.8 1411
TL /PTB GPSPPP TLT1 /PT02 1001-2016 / 1001-2016 0.3 2.4 1.8
TP /PTB GPSPPP TP04 /PT02 1002-2009 / 1001-2016 0.3 6.6 4.4
UA /PTB GPS MC UA04 /PT10 2003-2011 / 1001-2016 1.5 9.0 5.7
UAE /PTB NL
UME /PTB GPS P3 UM01 /PT02 1011-2016 / 1001-2016 0.7 3.1 1.8
VMI /PTB GPS MC VM__ /PT10 1013-2017 / 1001-2016 3.0 3.5 2.5
ZA /PTB GPSPPP ZA02 /PT02 1102-2016 / 1001-2016 0.3 4.3 1.5
Link Type Equipment Cal_ID uStb/ns uCal/ns uAg/ns Al/ns YYMM
CH /PTB TWGPPP CH01 /PTB05 0284-2012 0.3 1.9 1.5
IT /PTB TWGPPP IT02 /PTB05 0434-2016 0.3 1.2 0.7
NIST/PTB TWGPPP NIST01/PTB05 0393-2015 0.3 1.8 1.0
OP /PTB TWGPPP OP01 /PTB05 0437-2016 0.3 1.2 0.7
ROA /PTB TWGPPP ROA01 /PTB05 0440-2016 0.3 1.5 0.7
SP /PTB TWGPPP SP01 /PTB05 0441-2016 0.3 1.2 0.7
USNO/PTB TWGPPP USNO01/PTB05 0395-2016 0.3 1.2 0.5
VSL /PTB TWGPPP VSL01 /PTB05 0295-2015 0.3 1.3 0.8