/usr/share/sdformat/1.4/sonar.sdf is in libsdformat1 1.4.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | <element name="sonar" required="0">
<description>These elements are specific to the sonar sensor.</description>
<element name="min" type="double" default="0" required="1">
<description>Minimum range</description>
</element>
<element name="max" type="double" default="1.0" required="1">
<description>Max range</description>
</element>
<element name="radius" type="double" default="0.5" required="1">
<description>Radius of the sonar cone at max range.</description>
</element>
</element>
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