ACS true‐color images around the nine ULXs in M51. Red, green, and blue correspond to the F435W, F555W, and F814W filters, respectively. The adopted error circles of ULXs, with a 0﹩\farcs﹩3 radius, are shown. The size of each image is ﹩15^{\prime \prime }\times 15^{\prime \prime }﹩ or ﹩610\ \mathrm{pc}\,\times 610﹩ pc. North is up, and east is to the left. Panels a–i correspond to ULX‐1 to ULX‐9, respectively.