Investigate ghosts and crosstalk

Ghosts of strong calibration lines are seen in the data when taking arcs and are probably elsewhere in the data. The ghosts should be investigated to see when, where, and how often they are appearing.

Some of these ghosts could be the result of electronic crosstalk, which would not be continuous over amplifier boundaries and can be checked.

An example of a discovered ghost is seen in the data below, including the raw. The lines here don't seem to be continuous over the amplifier but should be investigated more as part of this ticket.