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The bottom panel shows a close relationship between the NTPClockOffset and the time derivative of NTPFreqOffset, which, I believe, indicates how NTP adjusts the system clock based on the measured offset. It also enforces the obvious conclusion that we could improve the time-keeping by insulating the CPU from temperature changes.
On a warmer 3 day period in July, where the temperatures were all above 5 degC, the temperature effect on the system clock oscillator is very evident.
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