While checking the new ADS matrix, I discovered a bug in the LSC model.  The ASC and ADS get length and power buildup signals from the LSC model.  These are then used as error signals for the ADS, and the buildups as potential dynamic power normalization options for ASC error signals.

However, what is supposed to be POPAIR_B_LF (POP DC) from the LSC model is actually currently REFLAIR_B_LF. The attached image is a tiny portion of the LSC model, showing that what goes up a level is actually coming from a REFL tag, not a POP tag.  (I'll try to remember to put more screenshots showing the signal flow later, but want to get this fixed since it's maint. day).

At LHO, we are not actually using this signal to run the IFO.  We just occasionally look at it if we're demodulating things trying to find new error signals, during commissioning time.  I'll call LLO to check if they use it, because if they do (I don't think they do), they'll need to check on things.