The last channel bin number in the list is the closing channel bin for the last range. If nothing is specified, all available energy channel bins are lumped into a single energy range. If only one number is provided, this is assumed to be the start channel bin of the single range that will contain all following channel bins. Fbssum will print the light curve for each of the channel ranges in a format that is suitable for plotting by most generic plotting packages. All this header information is formatted in such a way that it does not interfere with the plotting of the light curves.
Output is to the terminal.