Fig. 1

Layout of the simultaneous observations of NGC 1846 (bottom) and NGC 1844 (top) (from the HST Astronomer’s Proposal Tool). The individual ACS/WFC images are shown in magenta, and those of WFC3 (in both UVIS and NIR channels) in blue. Note the intrinsic different size of the two clusters, as they are at almost the same distance.
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