Histogram of the optical depth of line-free channels, shown before (pink) and after (green) weighting with their overlap in purple. The black solid line shows the Gaussian fit to the weighted subbands. Unweighted, the fit to the distribution has a mean of μuw = −1.4 × 10−3 and a standard deviation of σuw = 7.2 × 10−3. Weighted, the best-fit Gaussian has properties of μw = −1.3 × 10−3 and σw = 7.3 × 10−3. These subbands of M 82 were flagged and processed following the criteria of M14.
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