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| mv1612 |
05/31/2006 03:52PM (Read 3253 times)
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Registered: 05/31/2006
Posts: 5
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Hi,My first post here, if it is elementary I apologize, I just began learning IRAF. I'm working on some very high resolution spectra of a WR star. I need to cut the upper part of an emission line cause I would use the wings only for cross-correlation, to find a rotation curve. I have lots of spectra, so my question would be, can I do something like "cut the emission line from y=2 upwards and join the two wings by a straight line at y=2", for all the spectra simultaneously. The spectra are slightly moving in wavelength from one to the other, but the value y=2 would be good for all of them. Thanks, Virgil.
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| fitz |
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05/31/2006 03:52PM
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Registered: 09/30/2005
Posts: 4040
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If what you want is to simply clip all pixel values above 2 to the value 2, then look at IMREPLACE, e.g.cl> imreplace spec* 2 lower=2.0should do what you want.-Mike
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| mv1612 |
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05/31/2006 03:52PM
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Status: offline
Registered: 05/31/2006
Posts: 5
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It worked perfectly, thanks very much Mike!
Virgil.
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Cutting emission lines
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