 | Two more objects:
 | hsi_obs_background, for each flare a background spectrum, same energy bands as the obs_summary, all detector segments
 | hsi_flare_list
 | Same syntax, getdata, plot, list, etc
 | Some other routines (Kim): hsi_ui_flarecat() is a widget interface, hsi_read_flarelist, hsi_select_flare, hsi_format_flare
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