Equivalent width per unit reddening versus E_(B−V) for the 5780 and 5797 Å DIBs. Reduced chi-squared for linear fits are indicated in the respective panels. This plot reveals an intrinsic scatter on the relationship between the DIB strength and amount of dust in Upper Scorpius. Sightlines with E_(B−V)  <  0.1 mag (orange/grey squares) are omitted for calculating the correlation coefficient; r₅₇₈₀ = −0.32 and r₅₇₉₇ = 0.07.