Extinction profiles produced for systematics testing with best-fit power laws overplotted. Left panels show the full impact parameter range; right panels are cropped to high impact parameters. Top row: Gaia foreground cross-correlated with redMaGiC high-z (maroon) and high-density (red) background catalogs. Middle row: WISExSuperCOSMOS galaxy foreground cross-correlated with DES Y3 stars. Bottom row: cross-correlation of redMaGiC high-z foreground with z  <  0.45 high-density background.