- make a copy of your telluric spectrum: cp telluric.fits telluric_fixed.fits
    - splot and remove the telluric features and save:
            -O2 from about 6855-6960
	    -H2O from about 7100-7375
	    -O2 from about 7580-7680
	    -H2O from about 8135-8345
	    -H2O from about 8815-9830
	       => result should be a gentle line approximating the slope of the continuum.
    - divide the modified spectrum by the fixed spectrum
       > sarith telluric.fits / telluric_fixed.fits telluric_mult.fits
    - splot telluric_mult.fits and make sure the features are predominantly above one (edit if necessary).
    - multiply object spectrum by telluric_mult.fits
       > sarith object.fits * telluric_mult.fits object_tellcor.fits