Correlations between method B column density predictions (left frames) and method E column density predictions (right frames) with the values derived from noiseless data with a uniform resolution of 18.3″. The model consists of compact sources with radially increasing or decreasing temperature. The noise levels kn are indicated in the frames. The colours indicate the pixels in the warm sources (15–20 K, red points) and the cold sources (10–15 K, blue points).
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