Matt,
Here's some info on today's data (all times are UT):

Starting filling w/ LN2 @ 16.06

Time Image Pressure
16.42 10th 160
17.08 21st 89.9
17.45 37th 82.1
18.07 47th 59.1
18.22 52nd 56.7
18.39 59th 55.8