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Spot diagrams for the theoretical design of the Nasymth image derotator are reproduced in La Palma Technical Note 9.
The diagrams show some transverse chromatic aberration, giving a slightly larger image scale at longer wavelengths. If the images from 3300 to 10000Å are superimposed, these will make a line of about 0.70.2 arcsec in a radial direction. This has two effects: