FUNCTION: energy_to_ebin(dat,en) INPUT: dat: structure, 2d data structure filled by get_eesa_surv, get_eesa_burst, etc. en: real,fltarr, real or float array of energy values KEYWORD: BIN int,intarr optional, angle bins corresponding to "en" used when energies depend upon angle bin PURPOSE: Returns the energy bin numbers in "dat.energy" nearest to "en" CREATED BY: J.McFadden LAST MODIFICATION: 96-4-22 J.McFadden