Fig. 1
Overview Ks map of the W3 Main region; location of the regions discussed in the text and selected for plotting the CMDs (Fig. 9). The areas are circular, covering the bright Hii regions with a radius of 1′. The regions centered on IRS N3 and N4 cover the diffuse Hii regions W3 J and W3 K respectively. The region on IRS2 contains the compact Hii region W3A, and the area around IRS4 encompasses the Hii regions W3 D, W3 C and W3 H. The 1′ circle around IRS5 covers the youngest Hii regions: W3 B, W3 E , W3 F and W3 M.
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