Left panel: Spitzer-IRAC 8 μm emission map (gray scale) overlayed on Class I and Class II sources labeled as the blue and red dots, respectively. The unit of the gray bar is in MJy sr-1. Right panel: distributed map of Class I and Class II sources in the vicinity of H II region G53.54-0.01. Two green dashed ellipses mark the concentration of Class I and Class II sources.
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