Measured polarized contrast versus fractional IR luminosity for debris disks observed with SPHERE/IRDIS in broadband H (blue markers) and J (red markers). The axis ratio of each elliptical marker corresponds to the ratio of the minor to major axis of the respective disk, thereby visually representing the disk inclination. The blue dashed line denotes a linear fit to the H-band data for disks with inclinations higher than 75°, while the blue-shaded region indicates the 68% confidence interval for this fit.