We had EXES in medium res, pinhole, BP14100 filter, looking out at the gas cell close to the 4th order Q-branch.
We tried turns of 1-7 T on the echelle parabaloid mirror.
Data was analyzed by treating the odd/even effect on rows (dividing each row by its median value), and then using clickfit to measure the Gaussian width across the continuum.
The plot shows the FWHM (in pixels) as one goes left to right on the detector. The number above each curve denotes the number of turns on the echelle mirror. It seems that 3 has the best centering of the focus shift across the tilted detector, but 4T has a smaller FWHM in the center.
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