I downloaded spectra from Sloan Digital Sky Survey (SDSS), which has the following column headers
flux, loglam, ivar, and_mask, or_mask, wdisp, sky and model (determined by
I know about
flux, loglam, sky and model but I wanted to know what are the other headings are and where are they used. ['loglam' is the log10(wavelength)]
Also, is there any way from which I can determine redshift using the SDSS spectra, by not looking on the quasar page.