Figure 8: Perseus molecular cloud. Contours show radio emission at 16 GHz from the AMI telescope [189] with contours at intervals of 0.25 mJy beam−1 (~ ) overlaid on greyscale 850 μm data from SCUBA ([89, 90]; J. Hatchell, priv. comm.). The greyscale has been saturated at 500 mJy beam−1 (dark blue) to bring out the large-scale features. Crosses indicate the positions of Class 0 (green), Class I (red), and starless cores (grey).