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I'm having first experiences with IRAF.
I've been introduced by an astronomer who tough me how to use splot to grab info about spectra of quasars.
I've been calculating the average value at 5100A, but i have some problems with the units of measurement. I don't understand if the result is in erg/s/cm2 or if it is in erg/s/cm2.I know i hav'n been very clear, but i hope you'll be able and help me!
Thanks!

Depends on whether you flux-calibrated the spectrum or not (e.g. with the CALIBRATE task in ONEDSPEC). I'm also not sure whether you're referring to the pixel value at 5100A or the e.g. equivalent width of a line at 5100A.-Mike

I don't know if the spectrum is calibrated.
I know it is obtained by the SDSS (Sloan Digital Sky Survey), but I have been told just to find the data with the "splot" function... Nobody told me to calibrate the spectrum.
What i'm looking for is the continuum flux at the wavelength of 5100A, using the function on the "m" key (in the guide it says that it "Compute the mean, RMS, and signal-to-noise over a region marked with two x cursor positions.").I hope you can understand...
Thank you very much for the attention and the patience!

If the spectrum values are something like 10e-14 or so then they're probably already flux calibrated, numbers like 3000 indicate just counts.-Mike

Unfortunately i have only numbers that go from 0 up to 300...
So probably i have just the counts of the CCD...
Now... I have to say that i was told even to multiply the results for 10^-17... But i just don't know why... I can just suppose that the astronomer who gave me the spectra had calibrated them... But I'm not sure, and i can't contact him now...Thanks a lot for the attention!