Using the “subtract background” function in RSPEC Software to bring the baseline down towards zero on Altair spectrum from 10/10/2018

Following my recent post:

Attempt to generate instrument response curve in RSPEC software for CCDSPEC using Altair spectrum from 10/10/2018

Peter Hill asked me whether I had used the “subtract background” option in RSPEC to bring the baseline down towards zero on the spectrum – I had not done it and did not know what to do so I looked it up and here is the difference it makes……(below)

A dramatic improvement! Thanks Pete for the advice!

Andy

WITHOUT the “subtract background” feature being used (below):

WITH the “subtract background” feature being used (below):

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