Overview plot showing B3 continuum emission maps. The plots are shown with two colorbars, the first (grayscale) showing −5 to +15 times the noise on a linear scale, then a second (matplotlib’s inferno colorscheme) showing the range +15 times the noise to the peak intensity of the image in an arcsinh stretch. The field names are labeled in the top-right corner. A scalebar in the bottom-left shows the size of 0.5 pc at the target’s distance. The synthesized beam is shown as a blue ellipse in the bottom-left corner; it may be too small to print properly. Only the first four fields in B3 are shown here. The remaining figures are shown in Appendix H.