Some of these channels are not like the others.
All of the PEM channels seem to be okay right now. The accelerometers didn't turn out to have any differences in the traces when we put both XYZ triplets right next to each other, so we put them back where they belong. Gur2 seismometer was showing a few problems, especially with Gur2_X, as Rana posted in elog 2079. This was solved by tightening the cable screws which hold the Dsub end of the Guralp cable to the front panel of the Guralp box. All is now well.