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How to calculate the total flux of a source from a fits file?

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Debz
How to calculate the total flux of a source from a fits file?

 

 

My fits file is a spire 250micron image that has data units of Jy/beam . I injected a source into it with a peak intensity 20Jy and fwhm(3,3). How can I calculate the total flux of the source? Please help

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