/usr/share/geometry_msgs/msg/AccelWithCovariance.msg is in libgeometry-msgs-dev 1.12.3-5.
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 | # This expresses acceleration in free space with uncertainty.
Accel accel
# Row-major representation of the 6x6 covariance matrix
# The orientation parameters use a fixed-axis representation.
# In order, the parameters are:
# (x, y, z, rotation about X axis, rotation about Y axis, rotation about Z axis)
float64[36] covariance
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