1 539: interframe interval = 1/31.93 s avg=1/30.71 stddev=1/109.73
2 539: interframe interval = 1/35.37 s avg=1/30.90 stddev=1/103.09
3 539: interframe interval = 1/36.37 s avg=1/30.88 stddev=1/121.61
4 539: interframe interval = 1/33.03 s avg=1/30.64 stddev=1/93.19