Fig. 5
Distribution of properties of 18 optically thick HC H II regions identified in Sect. 4. The vertical and horizontal dotted and dashed lines indicate the standard quantitative criteria of an HC H II region. The red filled circles show HC H II regions and HC H II region candidates identified in this work while the red filled circles with lime circles identify the previously known HC H II regions. The filled blue circles show the intermediate objects between the HC H II andUC H II region stages. The magenta arrow shows the evolutionary trend.
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