Figure 5
From: On dispersion curve coloring for mechanical metafilters

Two curves intersecting at one point, with different slopes: (a) curve labeling preserving differentiability at the intersection; (b) curve labeling not preserving differentiability at the intersection, and associated with a higher objective value in Eq. (6) than the labeling in part (a) of the figure. Two curves intersecting at one point, with the same slope: (c) curve labeling preserving differentiability at the intersection; (d) nonequivalent curve labeling preserving differentiability at the intersection, and having the same objective value in Eq. (6) as the curve labeling in part (c) of the figure.