fits in channel space

Hi,

I have some uncalibrated laboratory data that I would like to fit with isis. I can supply isis with columns of data that are like a spectrum file: bin_lo, bin_hi, counts, and error. But the units of the x-axis are not wavelength or energy; the data are in an arbitrary channel space. I don't need to do anything particularly complicated. I just want to fit Gaussians to calibration lines, so that I can produce calibrated spectra.

As far as I can tell, if I want to fit spectral data that's not in a pha file, I need to use define_counts. Define_counts needs bin_lo and bin_hi to be in wavelength units. This is not an option unless I cheat. I could a.) use an approximate calibration to convert the spectrum to wavelength, fit the calibration lines, and then convert back to channel space; or b.) pretend that the arbitrary x-axis units are really wavelength (but then it would be very far outside of isis' normal wavelength range of operation).

Anyway, I'm sure there must be a relatively simple way to do this, but I don't know isis and slang well enough to have a guess. Any suggestions? Thanks,

Maurice
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