Observations of HD 191089, HD 157587, HD 115600, and HD 129590 (from top to bottom, respectively). The left subpanel shows the polarimetric observations, the central subpanel shows the total intensity, while the right subpanel shows the degree of polarization (polarimetry over total intensity). The scaling is linear for the right panels and between 0 and 1. For the left and center panels, the scaling is in square root. On the left panel, the horizontal bar represents 1″ and the distance in au is reported below. North is up, east is to the right, as indicated by the compass on the leftmost panels.