Hi Kate,
What smile settings have you used? If you do not have a calibration module, you can measure the smile using sky lines. I tried your images assuming vertical lines with no smile (by setting the Y smile to the same as the spectrum position and the radius to a large number eg 999999) and got an RMS of 1.14 A using a pixel size of 4.68um
————————————————————————–
Wavelength fit deviation
point #1 x = 704.340 lambda = 3834.491 dlambda = 0.899
point #2 x = 725.984 lambda = 3889.299 dlambda = -0.249
point #3 x = 758.121 lambda = 3970.993 dlambda = -0.913
point #4 x = 809.533 lambda = 4102.375 dlambda = -0.625
point #5 x = 901.554 lambda = 4339.253 dlambda = 1.227
point #6 x = 1102.840 lambda = 4861.706 dlambda = -0.366
point #7 x = 1771.045 lambda = 6562.745 dlambda = 0.065
point #8 x = 1898.937 lambda = 6872.037 dlambda = -0.037
————————————————————————–
Coefficient a4 : 3.006774E-11
Coefficient a3 : -2.735230E-07
Coefficient a2 : 6.837095E-04
Coefficient a1 : 1.92972
Coefficient a0 : 2221.769
————————————————————————–
RMS : 1.116470
————————————————————————–
In his ALPY tutorial, Christian Buil suggests an RMS of 2-3 A maximum is acceptable for this calibration method
Cheers
Robin