From a wavelength calibrated MOS arc lamp exposure, the mean spectral resolution from all lines in catalog is computed. Each single spectral resolution is computed as the ratio between the arc lamp line wavelength and its FWHM. The values trended here are for the 300V grism with a slit width of 1.0" and the order separation filter GG435. Data have been acquired using the blue-sensitive EEV detector.

More information can be found on the plot tutorial page