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I tried on my launch file:

<node pkg="hector_trajectory_server" type="hector_trajectory_server" name="hector_trajectory_server" output="screen">
    <param name="target_frame_name" type="string" value="/map" />
    <param name="source_frame_name" type="string" value="/base_link" />
    <param name="trajectory_update_rate" type="double" value="4" />
    <param name="trajectory_publish_rate" type="double" value="0.25" />

</node>

But after running it, it does not show the "trajectory" topic to uses on RViz. Please, do you know if another package shall be included on launch file to enable trajectory (nav_msgs/Path) ?