With the H1 and L1 HIFO X runs approaching, I have revisited and updated the H1 HIFO Y line finding report I gave at the Hannover Detchar F2F meeting in September.  Attached are slightly updated slides with some additional info (mostly on slides 42-44 with a few clarifications elsewhere) on lines found in the transmitted IR light on half-fringe power. Since I neglected to alog the original report, I am including the full report here for reference (both ppt and pdf, to enable future searches for particular frequencies - I hope).