Relation between the significant peak (S > 0) of the P3/P0 profile and the center shift parameter for different morphologies. A tighter correlation than in the P3/P0–w plane (Fig. 13) can be seen. In addition, a clearer separation between the different morphological categories is apparent. The horizontal lines mark the P3/P0 boundaries (solid: simple at 10^-7, dotted: morphological at 5 × 10^-7 and 10^-8), the vertical line displays the wboundary at 10^-2. The colors are as described in Fig. 13.