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Summary of main LEXT internal parameters

These LEXT parameters are essential for mask design.

• X_FORMAT and Y_FORMAT -- extent of CCD array
• XPIX and YPIX -- pixel size (m)
• SCALE -- Image scale at mask (arcsec/mm)
• FRED -- focal reduction factor between telescope and camera
• SLITWIDTH -- slit width (arcsec; only affects the plotting in LEXT)
• FIDUCDIAM -- diameter of fiducial holes (arcsec)
• MINSLITLEN and MAXSLITLEN -- minimum and maximum slit widths (arcsec)
• MINYSEP -- minimum distance between adjacent slits (arcsec)
• MINYMARGIN -- minimum distance between an object and the slit ends (arcsec)
• OBJECTEXTENT -- default extent of the targets (arcsec)
• DISPERSION -- the dispersion at the detector (Å/mm)
• LAMMIN and LAMMAX -- the minimum and maximum wavelengths considered (Å)
• LAMZERO -- the wavelength of zero order (Å ; normally zero)
• LAMBLAZE -- the undeviated wavelength (Å ; usually close to blaze)