Return the photon energy corresponding to a given grating dispersion (GAC) value.
Double_Type pix_get_energy( Double_Type x, Double_Type y )
Calculates the photon energy, in keV, for a given grating
position and using the current pixlib settings.
The x and y values are in the GAC coordinate system, and so
represent the grating dispersion and cross-dispersion
angles in degrees. The grating order - as set by
pix_set_grating() - must be non-zero for this routine
to work.
The pix_get_grating_wavelength() routine can be used to find
the wavelength of the photon instead of the energy.
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