Fig. 4.
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Stacked images and CMDs of stellar fields with different ages and stellar densities. North is up and east to the right. Top panels: F475W image and the mF475W vs. mF475W − mF814W CMD of stars in the star-forming region around the very young cluster NGC 1966. Middle and bottom panels: illustrate the F814W stacked images and the CMDs of the intermediate-age cluster NGC 2121 (age ∼ 3 Gyr) and the old GC NGC 2210 (age ∼ 12 Gyr), respectively.
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