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I have been using ISIS to process my flare star spectra. I need to process some 80 or so spectra so have been using the @pro# products to give the individual spectra.

However, I find the @pro1 product is scaled differently to the rest. To test this I copied the same image 3 time and made them into a sequence i.e. they were all identical.The attached image show the @pro1 product compared to @pro2. You get the same result with @pro3 and 4.

Regards Andrew

I find the latest version does not normalise the @pro# products and the unnormalised product are as expected so the problem is "solved".
Regards Andrew

Hi Andrews,

That's right. This allows a better comparison of the relative flux in a sequence and absolute calibrations. But I admit that this does not facilitate comparisons.

Note the existence of the L_NORM command to normalize a sequence between two wavelengths. Example:

>L_NORM IN- OUT- 14 6620 6640

Christian