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The procedure CENWAVE allows the user to set the grating angles to appropriate values for a specified central wavelength, however the zero point of the grating angle is not known precisely and has been known to change. Observers are recommended to check their central wavelength with an appropriate comparison spectrum, and report any discrepancy to the WHT Telescope manager. If the exact grating angles are known they can be set with the commands REDGRAT and BLUEGRAT.