Finding chart: Hα emission of the Gum Nebula region (from NASA/Skyview) with the 24 sources indicated by their name. The color code is the following: red = PAH/BRC emission, white = absorption, green = coreshine, yellow = absorption + coreshine, purple = PAH + coreshine. Full line circles indicate clear coreshine cases, dashed line circles indicate dubious coreshine cases. The cross in the middle is the reference position α_J2000 = 08^h22^m53.6^s, δ_J2000 = −42°25′20′′ for the Gum Nebula center.