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2. The soil motes apparently had a "watchdog timeout" that reset power on the soil sensors rather frequently.  I believe that this occurred at all sites sometime, and, when bad, happens every ~4hours:50minutes.  Each time, the TP01 reported values of 0 until it was able to take another reading.  These 0 values were averaged in to each TP01 variable, generating lots of spikes.  A range check on the TP01 Vheat and Tau63 values has now been added to eliminate these zeros.  The covars are being rerun now.

(Note that gaps of one sample (5 s) every 5-minutes are normal, as John's code uses this time to sample the mote's power voltage.)

3. Even with all this, the comparison is good at only about 1/2 of the sites.  ("Good" means that the change of Cvsoil with Qsoil follows what I would expect.  "Bad" means that Cvsoil changes more than I would expect.)  I can trace the bad values to Vpile.on being too low at many of the sites.  (asoil values seem reasonable at all sites and Vpile.off and Vheat -- the only other variables in the Lambdasoil calculation -- are okay.)  This is true at most of these sites even during the last half of January, when there was a warm period that might have thawed the soil.  Possible reasons for Vpile.on being low are:

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