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What you have seen in the docs is wrong, can you link your doc ? In the official documentation of the rqt_plot package there is this note specifying the proper syntax.

The link says :

The input value should be the full path to the value

So in rqt_plot you need to type /topic_name/field/field...

If you want to plot the x coordinate from your topic you need to type :

/vslam/pose/pose/pose/position/x

NB : There are 3 pose because the output of rosmsg show seems to indicate that your topic /vslam/pose publish geometry_msgs/PoseWithCovarianceStamped messages instead of geometry_msgs/PoseWithCovariance as you said. That means the first pose is from the topic name, the second one is the field of type geometry_msgs/PoseWithCovariance and the last one for the geometry_msgs/Pose field.