Calibration Information Line lists for the Copper-Argon, Copper-Neon and Copper-Argon-Neon calibration lamps for the IDS spectrograph. Arc maps from ISIS on the WHT, Blue arm (IPCS detector) (2400 line/mm grating, dispersion 0.08 Angstroms/pixel and slit width 120 microns), and Red arm (GEC CCD detector) (600 line/mm grating, dispersion 0.73 Angstroms/pixel and slit width 120 microns). Tables of flux against wavelengths for some spectrophotometric standards. Jeremy Walsh at ST-ECF has compiled a very useful set of pages with information on optical and UV spectrophotometric standard stars. Flux lists for many standards There are finding charts of some of the new Landolt photometric standard sequences. Extinction: La Palma extinction values as a function of wavelength. Also tabulated extinction values in V This page last updated: 11 Oct 2000 S.F.Sánchez (sanchez@ing.iac.es)