Fig. 1.

Clustered spiky steady state of (1.2) for ${\mathit{\epsilon }}^2=0.001,D=0.01,\mathit{\mu }(|y|)=1+{5|y|}^2$. Shown is a 3-spike cluster consisting of 3 spikes on a regular polygon. The activator A is displayed in two three-dimensional surface plots from different perspectives in the top two graphs and its projection to the domain plane is shown in the bottom graph