The output hz of approximate synchronized messages.
% roslaunch jsk_20160505_test_message_filters string.launch % rostopic hz /join_strings/output subscribed to [/join_strings/output] average rate: 0.997 min: 1.003s max: 1.003s std dev: 0.00000s window: 2 average rate: 0.996 min: 1.003s max: 1.004s std dev: 0.00019s window: 3 average rate: 0.975 min: 1.003s max: 1.070s std dev: 0.03121s window: 4 average rate: 0.962 min: 1.003s max: 1.079s std dev: 0.03554s window: 5 average rate: 0.949 min: 1.003s max: 1.112s std dev: 0.04305s window: 6 average rate: 0.925 min: 1.003s max: 1.219s std dev: 0.07304s window: 7 average rate: 0.915 min: 1.003s max: 1.219s std dev: 0.07346s window: 8 no new messages average rate: 0.887 min: 1.003s max: 1.373s std dev: 0.11528s window: 9 average rate: 0.871 min: 1.003s max: 1.373s std dev: 0.12357s window: 10 no new messages average rate: 0.786 min: 1.003s max: 2.381s std dev: 0.38777s window: 11 no new messages no new messages no new messages no new messages average rate: 0.621 min: 1.003s max: 5.008s std dev: 1.13588s window: 12 no new messages no new messages average rate: 0.579 min: 1.003s max: 5.008s std dev: 1.15229s window: 13 no new messages no new messages no new messages no new messages average rate: 0.519 min: 1.003s max: 5.008s std dev: 1.30438s window: 14 no new messages no new messages no new messages average rate: 0.470 min: 1.003s max: 5.008s std dev: 1.45689s window: 15 no new messages