eb_index

EB_INDEX is the index into the energy bin array (starting at 0) to use. Used in conjunction with IM_ENERGY_BINNING. IM_ENERGY_BINNING defines energy binning for making images.

ENERGY_BAND will be set to the energy edges actually used.

The advantage of using IM_ENERGY_BINNING and EB_INDEX instead of ENERGY_BAND is that it will be faster if you are doing multiple energy bins for a time range, since the binned eventlist will only be called once for a given time range.