Background data loaded.
Then use Reduce|BGData|PLOT to plot BGRate for all channels of the two spectrometers. The first one looks like this:
Note that there are almost no counts in channel 11, which is due to
a HeNe laser notch filter. We flag these data manually (just plot
channel 11 and then use Util|Edit to flag; re-plot to check whether
all the data has been flagged); when OYSTER averages
point data, any data without valid background scans will be discarded.