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As with most thinned chips, interference fringes are evident in the red.
The fringes have peak-to-peak amplitudes of 5% at 8000Å and 16% at
The fringe spacing is about 50Å at 9000. Internal projection flats
(quartz) do a reasonable job of removing these fringes IF TAKEN AT THE
POSITION OF THE OBJECT so as to minimize wavelength shift due to flexure.
Figure 9 shows fringes from a setup with Grating 58.