echelle,b,h,no,,,"Echelle grating?"
f,r,h,590.,,,"Focal length (mm)"
gmm,r,h,226.,,,"Grating grooves per mm"
blaze,r,h,4.5,,,"Blaze angle (degrees)"
theta,r,h,-10.5,,,"Incidence angle (degrees)"
order,i,h,1,,,"Reference order"
wavelength,r,h,INDEF,,,"Blaze wavelength (Angstroms)"
dispersion,r,h,INDEF,,,"Blaze dispersion (Angstroms/mm)"