$t$	$ω$
$t \leq 0.5 T$	2
$0.5 T < t \leq 0.75 T$	3
$0.75 T < t \leq 0.9 T$	4
$0.9 T < t \leq 0.95 T$	5
$0.95 T < t \leq T$	6