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Fig. 3

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Left panels: spatial distribution of CO emission in three velocity ranges. The velocity range is given in the upper right corner of each map. The line temperature is averaged over the corresponding velocity range. In the velocity range  ~−58 to  −46 km s-1, the lowest contour is 0.5 K (~20 rms) and the contour spacing is 0.35 K. In the velocity range  − 44 to  − 38 km s-1, the lowest contour is 0.35 K (~14 rms) and the contour spacing is 0.7 K. In the velocity range  −33 to  −28 km s-1, the lowest contour is 0.42 K (~11 rms) and the contour spacing is 0.21 K. In all cases, the greyscale goes from 0.35 to 3.15 K. The position of WR 55 is marked by a plus sign at the center of each image. The beam size of the CO observations is shown by a circle in the upper left panel. Right panels: overlay of the mean CO emission (contours) in the three velocity ranges and the SHS Hα emission of RCW 78 (grey scale).

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