Primary vs. secondary extinctions . Target binaries with at least one component with strong near-IR color excess E(K_s−L′) > 0.5 are marked by a red circle. The dotted line shows equal extinctions in both compononents. The three magenta stars (CHXR 73, T 26, T 33) have at least one component without measured E(K_s−L′). From their very red color of H−K > 0.6 mag a strong near-IR excess can also be inferred for these binaries.