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| danila |
10/04/2006 06:17PM (Read 5098 times)
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Registered: 06/30/2006
Posts: 15
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Hello everybody!I am trying to learn how to estimate errors of line fluxes determination by SPLOT. As I understand from "ERROR ESTIMATES" part of description of SPLOT help it is needed to specify two parameters: "inverse gain" or invgain and "constant gaussian sigma " or sigma0. I understand what is invgain. But what is sigma0 and how can I find this?Thanks for your attention!Andrey.
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| malte |
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10/04/2006 06:17PM
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Status: offline
Registered: 03/16/2006
Posts: 9
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I've just been looking into this myself. [i:ff172949b3]sigma0[/i:ff172949b3] seems to be the equivalent of the readout noise, i.e. some sort of constant noise that every pixel has.My question is instead this: What's the best way of estimating [i:ff172949b3]sigma0[/i:ff172949b3] (or for that matter [i:ff172949b3]invgain[/i:ff172949b3]) from my spectrum? The help file says 'These parameters would need to be estimated in some way using the statistics of the spectrum', but doesn't make any suggestions.
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| fitz |
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10/04/2006 06:17PM
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Registered: 09/30/2005
Posts: 4040
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See the explanation in https://iraf.net/phpBB2/viewtopic.php?t=83675&highlight=sigma0+invgain for more information (at least until Frank responds).-Mike
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error estimates with SPLOT
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