Fig. 8
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Diagram of rcalc and ne. Previously derived rcalc–ne relationships for UCHII regions from Garay & Lizano (1999), ne = 780 × (2r)−1.19, and from Kim & Koo (2001), ne = 790 × (2r)−∞, are plotted as dashed lines. The green shading indicates the typical ne of UCHII regions, which is from ~104 cm−3 to ~106 cm−3, and the typical r of UCHII regions, which is ~0.015 to ~0.05 pc (Kurtz 2005).
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