(panel-c) or short-range (panel-d) attraction).

![\[fig:nct\_xi1\_0\] Time evolutions of the mean cluster size for squirmers when $\xi=1$ (pullers: red [squares]{} and black [circles]{}; neutral: blue [up triangles]{}; pushers: pink [down-triangles]{} and grey [diamonds]{}). (a) AP squirmers with $r_c=2.5\sigma$ and (b) $r_c=1.5\sigma$, (c) WP squirmers with $r_c=2.5\sigma$ and (d) $r_c=1.5\sigma$. Note the different scale on the y-axis. ](ntxi1rc25ttganso.pdf "fig:"){width="0.48\columnwidth"} ![\[fig:nct\_xi1\_0\] Time evolutions of the mean cluster size for squirmers when $\xi=1$ (pullers: red [squares]{} and black [circles]{}; neutral: blue [up triangles]{}; pushers: pink [down-triangles]{} and grey [diamonds]{}). (a) AP squirmers with $r_c=2.5\sigma$ and (b) $r_c=1.5\sigma$, (c) WP squirmers with $r_c=2.5\sigma$ and (d) $r_c=1.5\sigma$. Note the different scale on the y-axis. ](ntxi1rc15ttganso.pdf "fig:"){width="0.48\columnwidth"} ![\[fig:nct\_xi1\_0\] Time evolutions of the mean cluster size for squirmers when $\xi=1$ (pullers: red [squares]{} and black [circles]{}; neutral: blue [up triangles]{}; pushers: pink [down-triangles]{} and grey [diamonds]{}). (a) AP squirmers with $r_c=2.5\sigma$ and (b) $r_c=1.5\sigma$, (c) WP squirmers with $r_c=2.5\sigma$ and (d) $r_c=1.5\sigma$. Note the different scale on the y-axis. ](ntxi1rc25hhganso.pdf "fig:"){width="0.48\columnwidth"}![\[fig:nct\_xi1\_0\] Time evolutions of the mean cluster size for squirmers when $\xi=1$ (pullers: red [squares]{} and black [circles]{}; neutral: blue [up triangles]{}; pushers: pink [down-triangles]{} and grey [diamonds]{}). (a) AP squirmers with $r_c=2.5\sigma$ and (b) $r_c=1.5\sigma$, (c) 