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I can see 4 possible actions:

Wiki Markup1. Keep the present configuration and hope that the tubing temperature fluctuations are not correlated with w (though other p' statistics might have errors).    It would be best if we could get a better sensor (another 202BG) to monitor Pref, but our spare 202BG is now dead.    (Should we sacrifice one of the 14?)
2. Treat the tubing so that the temperature changes are smaller.    (This was the reason I chose clear tubing originally.    Perhaps simply washing it would reduce temperature changes?)    It isn't clear what else I could do (wrap it all in foil?).
3. Make an even bigger reservoir\!    (Home depot has lots of pipe\!)
4. Rebuild the entire array with individual reservoirs.&nbsp;   (How would they be made thermally stable?&nbsp;   The reservoirs would have to be on the towers \ [and cause <more> flow distortion\].)