Montage of [C ii] spectra towards DR21(OH). A baseline has been subtracted from all spectra. The horizontal axis is the LSR velocity in km s^-1, which runs from −28 km s^-1 to 38 km s^-1, and the vertical axis is the antenna temperature in Kelvins, which runs from −4 K to 14 K. The x-axis shows the right ascension offset in arcsec and the y-axis the declination offset in arcsec, relative to the source position given in Table 1.