Solid lines are radial profiles of the optical depth τ of disk models based on Oka et al. (2012), with or without photodesorption (photosputtering; PS) along the disk major axis. The overplotted points are the measured τ along the disk major axis (SE, NW directions). SE data points are slightly shifted (+1 au) to avoid overlapping with the NW error bars. Both disk models are consistent with the measurements; however, the model with the photodesorption effect (“with PS”) might show a slightly better match with the observations.