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Gaba_p
 11/03/2016 05:22PM (Read 1030 times)  
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The output of imexamine's 'a' (performed over a star) includes the "mean background" in the column named 'SKY'.

What is the difference with the 'm' column 'STDDEV' performed on a sky region?

Shouldn't these two parameters be equivalent?

 
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Gaba_p
 11/03/2016 05:32PM  
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I messed up the title of the post, but there's apparently no way to edit it or to remove the post...

 
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fitz
 11/14/2016 05:42PM  
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The 'm' key does straight image statistics on a rectangular region, however the 'a' key fits a surface when computing the sky background within the object aperture. The two results should be close but not necessarily equal.

 
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