Fig. A.4
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Zooming in on characteristic ring-like artifacts, we present four column density maps (G012.80, G327.29, W43-MM2, and W43-MM3) in a left-to-right sequence. The top panel illustrates the initial PPMAP outputs, while the bottom panel displays the maps after undergoing post-processing as outlined in Appendix A.4. The color scale is logarithmic, to enhance visibility.
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