|AHELP for CIAO 4.2||
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.
See the bugs page for the pixlib library on the CIAO website for an up-to-date listing of known bugs.