Table 4 Characterization of the events and the occurrence frequency of swimmer 2 in the eight times of observation. Criteria Times of Observation Settings(moles) N IE 1st time 1b2,1b4,1c3,1t2,1p4 5 1 EMA 2nd time 1b8,1t5,1t7 1b8,1t6,1t7 3 2 ,60 ,60 PAP 1st time 2b3,2b4,2c1,2t2,2t4,2p4 2b3,2b4,2c2,2t1,2t4,2p4 2b3,2b4,2c2,2t2,2t4,2p4 1 2 2 ,20 ,40 ,40 2nd time 2b6,2p8 2b6,2p9 1 4 ,20 ,80 SAP 1st time 3b1,3b4,3c1,3t3,3p3 3b1,3b4,3c1,3t3,3p4 3b1,3b4,3c2,3t3,3p3 3b1,3b4,3c2,3t3,3p4 1 2 1 1 ,20 ,40 ,20 ,20 2nd time 3t5,3t8 3t6,3t8 4 1 ,80 ,20 SMRB 1st time 4b1,4c1,4t2,4t4,4p3 4b1,4c1,4t2,4t4,4p4 1 4 ,20 ,80 2nd time 4t7,4t12 5 1