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1. Linearity tests
2. Moon distance
The plot below shows sky counts/pixel above bias versus the Moon distance,
at the wavelength 5000 Å with the Moon illumination of 98%.
3. Acceptable wavelength ranges
The idea of this test is to check the range of Angstroms you can move the central wavelength of the original setup, for the setup to be still acceptable. This test is useful in situations when observers want to change the central wavelength during the night or in cases when there are little lines in a configuration and you have to move the central wavelength to be able to perform the setup. The following tests have been performed: