The range used to fit the continuum is just the opposite of the channels you flagged when creating the continuum (see Create an Averaged Continuum MS section of the Image Continuum guide. The continuum subtraction routine will then do a linear fit to each integration to determine the continuum and then subtract that linear fit from the data. ![]() Note that this behavior is different in the pipeline implementation of continuum subtraction hif_uvcontsub. You can use plotms to make sure that the appropriate data is in the appropriate column of your ms. To subtract the continuum, you need to select channel ranges which only contain continuum. You do not need to continuum subtract if the line of interest is an absorption line. If you have observations that include both line and strong continuum emission (>3 sigma per channel), you should subtract the continuum from the spectral windows before imaging the line. 3 Image line emission (repeat as necessary).2 Apply continuum self-calibration to line data (optional).1 Continuum Subtraction for Line Emission.
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