In rare cases, the automatic wavelength calibration may fail. The "WLC advanced" tab provides settings to tweak the method used in the fitting. The 2x2 grid of plots on the left show some useful diagnostics of the fitting.
Suggestions for parameter adjustments are given next to the various options on the lower right of the screen. After adjusting any of these, please make sure to reload the current frame on the main tab (not the WLC advanced tab) for the changes to take effect. Note: if the GUI is restarted, these settings will revert to their default values. If you find a set of values which work better than the defaults for an unusual arc/grating angle (or need help adjusting settings), please email David Gilbank mailto:gilbank"gilban AT @saao.dot ac.dot za " for these to be incorporated into the QL software. The default values should be robust for the most commonly used setups.