Figure7

Figure 7. Sliding variables $$ s(t) $$ of the followers in Figure 7A-D. A: Sliding variable $$ s(t) $$ of the 1st agent; B: Sliding variable $$ s(t) $$ of the 2nd agent; C: Sliding variable $$ s(t) $$ of the 3rd agent; D: Sliding variable $$ s(t) $$ of the 4th agent.