.title ch3_2.sp v1 1 0 0 pwl(0 0 .001ms 1 100ms 1 100.001ms 0) l1 1 2 .1 c1 2 0 .01 .save all @l1[i] .control tran .01m .4 plot v(1) v(2) plot @l1[i] .endc .end