

"ts","dur","part","a","b"
50,50,1,"[NULL]",14
100,50,1,10,14
150,350,1,10,"[NULL]"
500,50,1,11,"[NULL]"
550,50,1,11,15
600,50,1,"[NULL]",16
900,500,1,"[NULL]",17
50,100,2,"[NULL]",14
500,50,2,12,"[NULL]"
550,50,2,"[NULL]",15
600,50,2,"[NULL]",16
900,500,2,"[NULL]",17
50,100,3,"[NULL]",14
550,50,3,"[NULL]",15
600,50,3,13,16
650,50,3,13,"[NULL]"
900,500,3,"[NULL]",17