LHO got two STS2s returned from Stanford a few days ago and they are in the BG area.  One is installed as ITMY or STS2-B; the other is on temporary cabling going into HAM2 or STS2-A.  The attached ASD shows that the Y axis on unit A has excess noise below 3 hertz.  The noise is much less on the X & Z. It might be reasonable that the tilt condition is different between the BG location for Units A & B and the HAM5 location for Unit C so I'm not confident saying anything about the differences at low frequencies between A/B and C.  But A and B are within a couple meters of each other and we should expect the tilts for A & B to be very similar.  This further suggests the HAM2 unit has issues.  I should move unit A to its final location by HAM2 and its dedicated cabling but we've been down this swap fest route before.

The attachment data is from Sunday ~5am local