... The blue data have been divided through by a stellar blackbody of about 11000K to remove the detector and grating response. ... The red data has been divided by a cool halo giant (having removed the NaD, CaII and H lines) to remove the detector response, the dichroic response, and most of the telluric absorption. A few of the early red data was done with the 1200 line grating but this was changed to the 316 grating to get better coverage and see the red CN bands. ... Mike Bessell 30 March 2007 ...