gammapy.utils
gammapy.utils.fits.
energy_axis_to_ebounds
Convert EnergyBounds to OGIP EBOUNDS extension
EnergyBounds
EBOUNDS
see http://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/docs/memos/cal_gen_92_002/cal_gen_92_002.html#tth_sEc3.2