1 551: interframe interval = 1/27.44 s avg=1/30.54 stddev=1/103.70
2 539: interframe interval = 1/39.09 s avg=1/30.42 stddev=1/79.35
3 551: interframe interval = 1/26.97 s avg=1/30.47 stddev=1/84.13
4 539: interframe interval = 1/39.13 s avg=1/30.65 stddev=1/93.19