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Run example tcp-variants-comparison.cc which can be found in examples/tcp folder in ns-3. As a result of the execution, many .data files will be created. Plot the TcpVariantsComparison-rtt.data file using gnuplot. Follow the below steps for your task:

1. Configure ns-3 using command: ./waf configure --enable-examples
2. Build ns-3 using command: ./waf
3. Run the example tcp-variants-comparison.cc using below command:

        ./waf --run "tcp-variants-comparison --tracing=true"
   

4. Check if the file TcpVariantsComparison-rtt.data is created in the main ns-3 folder.
5. Use gnuplot to plot this file. The resultant graph should follow the below:

    Format of the graph: .png
    Name of the image: RTT.png
    Type of Graph: Impulse Graph
    X-axis label: Time (in Seconds)
    Y-axis label: RTT (in Seconds)
    Title of the graph: Round Trip Time Plot
    Position of the key: outside and top right corner