Sheila, Evan, Alexa, Stefan

The LSC MICH loop was a little marginal with phase, so we replaced its roll-off filter in FM5:
  Old:
    zpk([2.73333+i*81.9544;2.73333-i*81.9544;10+i*299.833;10-i*299.833],[16+i*27.7128;16-i*27.7128;4.0625+i*64.8729;4.0625-i*64.8729],1,"n")
  New:
    butter("LowPass",2,80)
We successfully reacquired twice with this filter, so we left it as a drop-in replacement for FM5. The old one is in FM1 for now.

The plot shows old and new filter.