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https://github.com/ros-visualization/rviz/blob/kinetic-devel/src/rviz/default_plugin/markers/text_view_facing_marker.cpp#L62 could set the fontName ( https://github.com/ros-visualization/rviz/blob/kinetic-devel/src/rviz/ogre_helpers/movable_text.cpp#L64 ) to something fixed width. 'Courier' maybe?

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