inertial parameters from file not showing up in gazebo UI [closed]

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I am running gazebo 9.0.0 on macOS 10.12.6. I am walking through this tutorial and I have created a file "velodyne.world" containing a ground plane, a model of a velodyne sensor, and a light source. I have added inertial moments to the file like this:

<?xml version="1.0" ?>
<sdf version="1.5">
  <world name="default">
    ...
    <model name="velodyne_hdl-32">
      <link name="top">
        <pose>0 0 0.095455 0 0 0</pose>
        <inertial>
          <mass>0.1</mass>
          <inertia>
            <ixx>0.000090623</ixx>
            <iyy>0.000090623</iyy>
            <izz>0.000091036</izz>
            <ixy>0</ixy>
            <ixz>0</ixz>
            <iyz>0</iyz>
          </inertia>
        </inertial>

       ...
  </world>
</sdf>

However, in the gazebo UI the inertial parameters do not show up when I expand the left panel (although the mass does show up). What mistake have I made?