Sheila, Robert, Jenne

This morning Sheila and Robert confirmed that the IMs were aligned with the flashing IMC beam, and that the beam went through the irides near PRM and PR2. 

We then determined that the DAC output of IM4 was unacceptably high (actually, we were railing it in order to get the beam aligned through the irides).  Sheila loosened IM4's clamps and rotated it in yaw a bit, and tightened it back up.  She then adjusted the pitch adjustment screw.  After each adjustment we realigned the beam onto the PR2 iris to check the size of the DAC output.  In the end, the largest DAC counts on IM4 are less than 50k, which is hopefully acceptable.  IM2 has larger DAC counts (up to 71k), but we think that should be fine since IM2 isn't used for as much steering as IM4 is.  IM1 and IM3 have smaller maximum DAC counts.  I attach a screenshot so we remember what our in-air situation was, for next time we vent.