/usr/share/doc/libplplot12/examples/ is in octave-plplot 5.10.0+dfsg-1.
This file is owned by root:root, with mode 0o755.
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/usr/share/doc/libplplot12/examples/octave/
/usr/share/doc/libplplot12/examples/octave/CMakeLists.txt
/usr/share/doc/libplplot12/examples/octave/diffn.m
/usr/share/doc/libplplot12/examples/octave/gradn.m
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/usr/share/doc/libplplot12/examples/octave/plplot_octave_demo.m
/usr/share/doc/libplplot12/examples/octave/rosenbrock.m
/usr/share/doc/libplplot12/examples/octave/x00c.m
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/usr/share/doc/libplplot12/examples/test_octave.sh
/usr/share/doc/libplplot12/examples/test_octave_interactive.sh