(K_s − λ) vs. (H − K_s) color-color diagrams for B59, for λ = 3.6 μm (top left), λ = 4.5 μm (top right), λ = 5.8 μm (bottom left), and λ = 8.0 μm (bottom right). The solid lines illustrate the reddening vectors for each band: the slopes are the LINES estimates, and the intercepts are such that the lines pass through the median of the distributions.