Extended Data Fig. 5: Maximum possible HISA temperature around DR21.
From: Ionized carbon as a tracer of the assembly of interstellar clouds

The strong continuum source DR21 stands out as a red spot with high temperatures of 175 K. Overall, the HISA temperature ranges between 90 and 120 K with an average of 100 K. The overlaid CII contours go from black to white with six contour levels corresponding to 50 K km/s to 210 K km/s by 40 K km/s. The blue filled circle indicates the location of the off position.