Hekp about RTT graphic in Wireshark

[Oscar Zúñiga <oscarfher666 () hotmail com>]

 Hi everyone

 

I'm working in Optical Networks. When Wireshark plots a RTT graphic of OBS network, appears two graphics (two points 
per every sequence number) as if I were plotting two RTTs ¿Can anyone explain me this?

 

thanks in advance 

 
                                          
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