Compare a measured spectrum (selected using an ss vector from
several contained in bsc_index and bsc_data) to spectra calculated using
BCS_SPEC (for channel chan, at a temperature of Te6 MK) using the
routine BCS_SPEC_PLOT. An example of the sequence of calls required
to do this is given below:
IDL> bcs_spec_plot,bsc_index,bsc_data,ss=ss
IDL> spec=bcs_spec(chan,Te6,wave=wave [,etc])
IDL> bcs_spec_plot,wave,spec,/over