If you interested only in whether the BCS has seen anything, use
BCS_24HR_PLOT. This works using only roadmap data and allows intervals
to de selected by date (all files covering this data are then used). By
default, channel 3 (Ca XIX) is plotted. Note: YODAT does NOT need to
have been run before BCS_24HR_PLOT. In its default mode, BCS_24HR_PLOT uses the
observing log files. Samples are:
IDL> bcs_24hr_plot, '15-nov-91'
IDL> bcs_24hr_plot, '15-nov-91', chan=4