Comparison of observed [ CII ] (histogram) and CO (2−1) (continuous line) profiles from SMC star-forming regions. In each panel the spatially averaged (27.3′′) profile is shown according to the legend in the upper left corner. The vertical scale is in main-beam brightness temperature T_mb in Kelvin. All CO (2−1) amplitudes have been multiplied by the factors indicated in each panel to match the [ CII ] profile as closely as possible. We note the very close overall similarity of [ CII ] and CO profiles.