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A plot of all of these data are at the end of this entry.  5  4 sites have only one data point (data weren't being recorded during the installation sample since there was no power, and these sites had been torn down before SO arrived).  11 sites have two samples and 1 site had 3 samples during the experiment.  Of the 12 sites with multiple samples, 8 had gains of nearly one.  From the two samples at the remaining 4 sites, 3 had gains greater than 1 – up to ~3 -- and one had a gain of about ~0.5.  With this limited sample, we will assume all gains were 1 and simply calculate a bias from these samples.  The resulting bias values range from -13 to +2%.