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OK I ran one of the images (052) through IRIS cropped and saved as a .fit file - imported into Vspec and selected what I thought were "real" features; the G band at 4308A and the Na doublet (not resolved) at 5895A to give a first calibration - this was then compared with a G2V spectrum....
The attached result shows the change in intensity across the spectrum due to the Bayer Matrix (Blue curve) and some absorption lines - the purple curve is a G2V comparison.
Yes, there is some detail there, but go back and compare this with the Baader grating/ needle results.....
Certainly an interesting start! (I'm glad I marinated those daks!)
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