247 lines
9.1 KiB
Plaintext
247 lines
9.1 KiB
Plaintext
Statistics file formats (README.stats)
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The xntp3 daemon can produce a variety of statistics files which are
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useful for maintenance, evaluation and retrospective calibration
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purposes. See the xntpd.8 man page for instructions on how to configure
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this feature. Since these files can become rather large and cumbersome,
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they are ordinarily reduced to summary form by running the summary.sh
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shell script once per day, week or month, as appropriate. There are
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three file collections presently defined: peerstats, loopstats and
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clockstats, each of which is described in this note.
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peerstats
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The following data are collected in the peerstats files. The files are
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reduced to summary data using the peer.sh shell script. See the peer.awk
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script for further information. A line in the file is produced upon
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reception of each valid update from a configured peer.
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49236 30.756 140.173.96.1 9474 0.000603 0.37532
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49236 modified Julian day number
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30.756 time of day (s) past midnight UTC
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140.173.96.1 peer identifier (IP address or receiver identifier)
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9474 peer status word (hex) (see NTP specification)
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0.000603 offset (s)
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0.08929 delay (s)
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0.37532 dispersion (s)
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loopstats
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The following data are collected in the loopstats files. The files are
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reduced to summary data using the loop.sh shell script. See the loop.awk
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script for further information. A line in the file is produced at each
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valid update of the local clock.
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49236 11.897 -0.000004 -35.9384 0
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49236 modified Julian day number
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11.897 time of day (s) past midnight UTC
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-0.000004 time offset (s)
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-35.9384 frequency offset (ppm)
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0 phase-lock loop time constant
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clockstats
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The following data are collected in the clockstats files. The files are
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reduced to summary data using the clock.sh shell script, which also
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updates the ensemble, etf, itf and tdata data files as well. See the
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clock.awk, ensemble.awk, etf.awk, itf.awk and tdta.awk scripts for
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further information. A line in the file is produced at each valid update
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received from a configured radio clock. Data are at present recorded for
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several radios. The first part of each data line is similar for all
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radios, e.g.:
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49234 60517.826 127.127.4.1 93 247 16:48:21.814
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49234 modified Julian day number
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60517.826 time of day (s) past midnight UTC
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127.127.4.1 receiver identifier (Spectracom 8170/Netclock-2)
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93 247 16:48:21.814 timecode (format varies)
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In the case of the Austron GPS receiver, a good deal of additional
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information is extracted from the radio, as described below. The formats
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shown consist of one line with all the fields shown in order. The
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timecode formats specific to each radio follow. See the file
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README.timecodes for detailed information on the timecode formats used
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by these radios.
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Spectracom 8170/Netclock-2 WWVB receiver
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49234 60517.826 127.127.4.1 ?A93 247 16:48:21.814
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The '?' and 'A' characters are present only when the receiver is
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unsynchronized; otherwise, they are replaced by space ' ' characters.
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IRIG audio decoder
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49234 60517.826 127.127.6.0 247 16:48:21?
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The '?' character is present only when the receiver is unsynchronized.
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Austron 2200A/2201A GPS receiver
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49234 60580.843 127.127.10.1 93:247:16:49:24.814?
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The '?' character is present only when the receiver is unsynchronized.
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Depending on the installed options, the Austron 2200A/2201A recognizes a
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number of special commands that report various data items. See the
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refclock_as2201.c source module for a list of the commands used. These
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data are collected only if the following line is included in the
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configuration file ntp.conf:
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fudge 127.127.10.1 flag4 1 # enable extended statistics collection
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The format of each data line returned is summarized in the following
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list.
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External time/frequency data (requires input buffer option IN)
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These data determine the deviations of external time/frequency inputs
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relative to receiver oscillator time. The following data are typical
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using an external cesium oscillator PPS and 5-MHz outputs.
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49234 60580.843 127.127.10.1 93:247:16:49:24.814 ETF
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-85.9 time interval (ns)
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-89.0 average time interval (ns)
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4.0 time interval sigma (ns)
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+1.510E-11 time interval rate
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-4.500E-11 deltaf/f
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+1.592E-11 average deltaf/f
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5.297E-13 sigma deltaf/f
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500 number of samples
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Model and option identifiers
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These data show the receiver model number and option configuration.
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49234 60708.848 127.127.10.1 93:247:16:51:32.817 ID;OPT;VER
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GPS 2201A model ident (must be "GPS 2200A" or "GPS 2201A")
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TTY1 rs232 option present (required)
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TC1 IRIG option present (optional)
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LORAN LORAN assist option present (optional)
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IN input buffer option present (optional)
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OUT1 output buffer option present (required)
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B.00 data processor software version ("B.00" or later)
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B.00 signal processor software version ("B.00" or later)
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28-Apr-93 software version date ("28-Apr-93" or later)
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Internal time/frequency data
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These data determine the deviations of the receiver oscillator with
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respect to satellite time.
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49234 60564.846 127.127.10.1 93:247:16:49:08.816 ITF
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COCO current mode (must be "COCO")
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0 code coast mode (must be zero)
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+6.6152E-08 code sigma (s)
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-3.5053E-08 code delta t (s)
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-4.0361E-11 deltat/t
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-6.4746E-11 oscillator ageing rate
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500.00 loop time constant
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4.984072 electrical tuning (V)
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GPS/LORAN ensemble data (requires LORAN assist option LORAN)
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These data determine the deviations and weights to calculate ensemble
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time from GPS and LORAN data.
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49234 60596.852 127.127.10.1 93:247:16:49:40.812 LORAN ENSEMBLE
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+9.06E-08 GPS t (s)
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+3.53E-08 GPS sigma (s)
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.532 GPS weight
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+3.71E-08 LORAN t (s)
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+3.76E-08 LORAN sigma (s)
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.468 LORAN weight
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+6.56E-08 ensemble t
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+6.94E-08 ensemble sigma (s)
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LORAN stationkeeping data (requires LORAN assist option LORAN)
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These data determine which stations of the LORAN chain are being
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tracked, together with individual signal/noise ratios, deviations and
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weights.
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49234 60532.850 127.127.10.1 93:247:16:48:36.820 LORAN TDATA
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M station identifier; data follows
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OK status (must be "OK" for tracking)
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0 cw flag
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0 sw flag
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1162.17 time of arrival
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-4.6 snr (-30.0 if not "OK" status)
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1.67E-07 2-sample phase-time deviation
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.507 weight (included only if "OK" status)
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W AQ 0 0 3387.80 -31.0 station identifier and data
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X OK 0 0 1740.27 -11.2 2.20E-07 .294 station identifier and data
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Y OK 0 0 2180.71 -4.6 2.68E-07 .198 station identifier and data
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Z CV 0 0 3392.94 -30.0 station identifier and data
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Oscillator status and environment
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These data determine the receiver oscillator type, mode, status and
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environment. Nominal operating conditions are shown below.
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49234 60628.847 127.127.10.1 93:247:16:50:12.817 OSC;ET;TEMP
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1121 Software Control oscillator model and mode (must be
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"Software Control")
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Locked status (must be "Locked")
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4.979905 electrical tuning (V)
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44.81 oscillator cavity temperature
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Receiver position, status and offsets
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These data determine the receiver position and elevation, together with
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programmable delay corrections for the antenna cable and receiver.
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49234 60788.847 127.127.10.1 93:247:16:52:52.817 POS;PPS;PPSOFF
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+39:40:48.425 receiver latitude (N)
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-075:45:02.392 receiver longitude (E)
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+74.09 receiver elevation (m)
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Stored position status (must be "Stored")
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UTC PPS/PPM alignment (must be "UTC")
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0 receiver delay (ns) (should be zero for calibrated
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receiver)
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200 cable delay (ns)
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0 user time bias (ns) (must be zero)
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Satellite tracking status
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These data determine how many satellites are being tracked. At the
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present state of constellation development, there should be at least
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three visible satellites in view. Much of the time the maximum of
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seven are being tracked; rarely this number drops to two.
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49234 60612.850 127.127.10.1 93:247:16:49:56.820 TRSTAT
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24 T satellite prn and status (T = track, A = acquire)
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16 A 13 T 20 T 18 T 07 T 12 T list continued
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UTC leap-second information
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These data determine when the next leap second is to occur. The exact
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method to use is obscure.
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49234 60548.847 127.127.10.1 93:247:16:48:52.818 UTC
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-1.2107E-08 A0 term (s)
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-1.2790E-13 A1 term (s)
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+9.0000E+00 current leap seconds (s)
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+2.0480E+05 time for leap seconds (s)
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+2.0100E+02 week number for delta leap (weeks)
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+1.9100E+02 week number for future leap (weeks)
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+4.0000E+00 day number for future leap (days)
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+9.0000E+00 future leap seconds (s)
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David L. Mills
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University of Delaware
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mills@udel.edu
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23 October 1993
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