/usr/ is in ngraph-gtk-addins 6.06.13-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/ngraph-gtk/
/usr/share/ngraph-gtk/addin/
/usr/share/ngraph-gtk/addin/calc.nsc
/usr/share/ngraph-gtk/addin/timer.nsc
/usr/share/ngraph-gtk/addin/text-in.nsc
/usr/share/ngraph-gtk/addin/legend.nsc
/usr/share/ngraph-gtk/addin/cal.nsc
/usr/share/ngraph-gtk/addin/append.nsc
/usr/share/ngraph-gtk/addin/math.nsc
/usr/share/ngraph-gtk/addin/fft.nsc
/usr/share/ngraph-gtk/addin/fitrslt.nsc
/usr/share/doc/
/usr/share/doc/ngraph-gtk-addins/
/usr/share/doc/ngraph-gtk-addins/copyright
/usr/share/doc/ngraph-gtk-addins/changelog.Debian.gz