Projection of our sample to the τλ-plane (Hertzsprung–Russell diagram, top panel) and πτ-plane (bottom panel). Most objects in the KEBC are constrained to the main sequence perpendicular to the τλ-plane. We remove objects lying above the solid black line drawn in the top panel. The bottom panel shows that the periods of most excised objects are inconsistent with the object being a typical contact binary star.