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Fig. 7
Zoom-in view of the six CH3OH maser groups of W3(OH). The dashed line in panel II is the best linear fit of the central CH3OH maser features (PA = 121°). A, B, and C are used to label three associations of 6.0-GHz OH, 12-GHz CH3OH, and 6.7-GHz CH3OH masers.
This figure is made of several images, please see below:
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