Comparison to Planck dust optical depth maps. Top four panels: Planck dust optical depth maps for Orion (top left), Cygnus X (top right), Perseus (upper middle left), and Taurus (upper middle right). Bottom four panels: ratio of total extinction predicted by our model to Planck optical depth normalised by the median of the ratio. Predicted extinction contours are overlaid. Ratio plots are arranged in the same pattern as the Planck emission maps.