Fig. 1
Blister H ii region Sh2-129 and Ou4. The DSS2 R-band image is shown in greyscale in the background. The red contour map is the Green Bank 6 cm survey (Condon et al. 1994) using 10 contours from 0.01 to 2.8 Jy/beam with a linear step. The green contour map is a smoothed and thresholded [O iii] image. The image and contour-map scales are logarithmic. The white arrowed line has a length of 
and indicates the position of the giant outflow Ou4. HR 8119, the young massive star that ionises Sh 2-129, is close to the middle of this line.
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