The three steps of the flexure compensation procedure. For each step, functions that are moved are highlighted in red. In step 1, panel a), the ArHgNeXe calibration lamps are switched on, the 3-position mirror in the A&G slide is set to the wide slot position and the 0.5′′ pinhole is inserted in the slit unit of each spectrograph; in step 2, panel b), the calibration lamp is still on, the 3-position mirror is set to the 0.5′′ pinhole position and the wide 5′′ slit is inserted in each slit unit; in step 3, panel c), the piezo mounted folding mirrors are moved according to the measurements obtained in step 1 and 2.
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