5780 Å (top), 5797 Å (middle), and 6284 Å (bottom) DIBs vs. N(Na I) (left) and N(K I) (right). Circles denote LMC sight lines; triangles denote SMC sight lines; all other symbols are for Galactic sight lines (see Fig. 8). The solid lines show weighted and unweighted fits to the Galactic data [with ﹩\mathrm{slopes}\,\sim 0.3{\mbox{--}} 0.5﹩ vs. N(Na I) and ~0.4–0.7 vs. N(K I); omitting "discrepant" sight lines].