Verticalized color distributions of the eMSTO stars of NGC 1783 in different combination of colors. The black circles represent eMSTO stars in the magnitude range 19.6 < m_F814W < 21.2, while the red circles mark the UV-dim stars selected as discussed in Section 7. The vertical dashed gray and red lines mark the median values of the verticalized colors for the eMSTO and UV-dim stars, respectively.