Frequency vs. temp

[Hal Murray]

> Do you really mean "frequency drift" or rather  "frequency offset"?

I said "drift" rather than "frequency drift".  A frequency offset turns into 
a time drift.


> Merging two files actually is easy, provided that the timestamps align
> exactly: 

The point was that the timestamps don't align exactly.  To get the graph I 
wanted it seemed much easier to "fix" the temperature collection program.  
You can read the drift/frequency-offset from the kernel via ntp_adjtime.

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