P_I images at H band after applying a Sobel filter to highlight the regions of the image with edges. The three arrows indicate spiral arms on the disk. For comparison, we used the same notation as in Casassus et al. (2012) (see also Rameau et al. 2012) to label the spiral arms. The spiral arm labeled “2” perfectly matches its equivalent in Casassus et al. (2012). The spiral arm labeled “3” is barely visible in our images. The spiral arm on the east side is detected for the first time. Color bar is in arbitrary units.