﹩E(V-{K}_{s})﹩ vs. other color excesses for O- and B-type stars in W3, used to constrain the extinction law in their direction. Pluses and open diamonds are values assuming a given star to be of the earliest and latest spectral type in its range, respectively (the two symbols lie atop each other for stars whose spectral type could be determined to within one subtype). Solid lines are least-squares fits to the points with the intercept fixed at zero, and the dashed line in the left plot is the fit for ﹩E(V-{K}_{s})﹩ vs. ﹩E(B-V)﹩ repeated without constraints on the intercept.