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I have converted some CALSPEC spectrophotometry standatds to .dat as they are in Fits table format.

I have tried converting to normal fits using the ISIS-> profile -> save function and saving as .fit However I find there seems to be an error in the conversion. See the comparison.
Here is an image of the start of the .dat file I think the issue is that ISIS is assuming a constant increment looking at the full .dat file the increment varies.

Regards Andrew

Hello Andrew,

When I converted the NGSL files from FITS table format I had the same problem. I defined a regular wavelength spacing and quadratic interpolated the original flux grid onto that using interp1d to produce the simple FITS file version.

David