 ![Panel a) WP Janus swimmers. Panel b) AP Janus swimmers. The attractive patch is represented in blue [(dark gray)]{}, and the non-attractive patch is in green [(light gray)]{}. The swimming direction $\hat{e}$ is the red arrow and direction of the attractive patch $\hat{p}$ is the green one. The center-to-center distance between two swimmers $\vec{r_{ij}}$ is the black vector. \[fig:JanusSquirmers\]](