Weighted least-squares linear fit of EW_DIB vs. extinction to the background star as measured by Bayestar19 (Green et al. 2019) in the range 0 < A _V < 1. The color scale indicates EW_DIB inverse-variance weighted number density, where darker colors indicate more (confident) detections and a log normalization has been applied. Scatter points represent inverse-variance weighted mean EW_DIB for each Av bin.