...
Note that at 1140, I opened up the reference tubing to re-route a piece near 5b.
P.S. Spectra from yesterday (7/30) and today (7/31) at 17:00 and 21:00 show that there is some modest improvement even with only this partial tubing. (In these plots, 11b is Pref and 6b is p-Pref.) We'll see tomorrow when the rest are done. 