threshhold (rms)  duration (s)

     0.000000000     0.007840206
     0.300000012     0.005190162
     0.600000024     0.004445502
     0.899999976     0.004255200
     1.200000048     0.004165368
     1.500000000     0.004064898
     1.799999952     0.004001070
     2.099999905     0.003979794
     2.400000095     0.003991614
     2.700000048     0.003952608
     3.000000000     0.003944334