ENERGIES extension

There will be a BINTABLE extension called ENERGIES containing the energy bins. The columns ENERG_LO and ENERG_HI comprise the lower and upper energy of each spectral bin. Note that the bins must be contiguous (ie energ_hi(i) = energ_lo(i+1)).

This extension should also include the standard OGIP keywords :

HDUCLASS 		 'OGIP'           


HDUCLAS1 		 'XSPEC TABLE MODEL'    


HDUCLAS2 		 'ENERGIES'    


HDUVERS 		 '1.0.0'