The new version has not been thoroughly tested, please send me (Tom Barlow) email if you have any problems (email@example.com).
Also, note some new comments on ESI flux calibration: (Flux Calibration).
October 2018: Increased maxpixsub value in maxpix.inc to work better with ESI.
October 2018: Created a Arc-HgNeXeCuAr.fits file so now ESI reductions work with arc lamp exposures containing both HgNeXe and CuAr.
October 2018: Allowed interpolation of bad columns in ESI data (problem with 2nd bluest echelle order).