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- NTPClockOffset: the estimated offset of the GPS time from the data system time. A positive value indicates that NTP is estimating has determined that the GPS clock is ahead of the system clock, i.e. the GPS is showing a later time than the system clock. The maximum, minimum and mean values of NTPClockOffset in each 5 minute period are computed and written to the NetCDF files and plotted as NTPClockOffset_max, NTPClockOffset_min and NTPClockOffset.
- NTPFreqOffset: the correction applied to the system clock frequency in parts-per-million, a . A positive value indicates that NTP has determined that the system clock oscillator is slow and the frequency offset is NTPFreqOffset PPM values are being added periodically to the system clock valuescounter. The NetCDF files and plots contain 5 minute means of NTPFreqOffset.
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