Select a TCP segment in the Wireshark’s “listing of captured-packets” window. Then select the menu : Statistics->TCP Stream Graph-> Time-Sequence-Graph(Stevens). You should see a plot that looks similar to the following plot, which was created from the captured packets in the packet trace tcp-ethereal-
trace-1 in http://gaia.cs.umass.edu/wireshark-labs/wireshark-traces.zip (see earlier footnote )