Figure 3

Protocol used for quantitative sharpness analysis. The PV sharpness was measured at multiple locations (white segments) and was averaged over all locations. The PV sharpness on a given segment was measured as 1/d where d represents the distance in millimeter required to transition from the 80% threshold (I _min + (I _max -I _min ) × 0.8) to the 20% threshold (I _min + (I _max -I _min ) × 0.2) of the intensity profile.