For the matched stack catalog, the r − Hα color against r − i (top) and g − r (bottom), for sources within the plane (left) and beyond (right). We overlay synthetic tracks from MIST, for the main sequence (solid red) and the reddening vectors (up to A_v = 6) for A2V, F5V, and M0V spectral types (blue, green, and orange dashed lines, respectively). The effect of reddening on our sources is significant in the plane and less so outside it. Further discussion can be found in Section 5.1.1.