Phase diagram for ribbed patterning.

Ribbed patterns emerge as a function of the stress tensor coupling. The symmetry of ribs increases as a function of η. The dotted lines represent the boundary limits for 3- to 8-symmetry (S3, S4, S5, S6, S7, S8) and the numerical limit values are indicated in red on η axis. Note that in all cases the symmetry of the pattern is below of the limit value, which means that in some cases, the stress coupling γ raises the symmetry. Emergence of aberrant patterns (AB) is indicated with dashed blue lines. The values of η for each image are indicated on η axis (in black) and the rest of the parameter values are β = 0.5, G[u] with a width of R/1.5, κ = 0.5 and c = 0.