(m_F160W, m_F110W − m_F160W) CMD before the correction for differential reddening (left panel), after the correction for differential reddening (central panel), and after the correction for differential reddening by considering only the stars within 45″ from the center, as defined in Sect. 6 (right panel). The reddening vector is represented in the left panel as a red arrow. The red crosses in the right panel represent the 3σ mean uncertainties on the color and the magnitude for each magnitude bin.