/usr/lib/Wt/examples/chart3D/ is in witty-examples 3.3.3+dfsg-4.1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/Wt/examples/chart3D/CMakeLists.txt
/usr/lib/Wt/examples/chart3D/CategoryExample.C
/usr/lib/Wt/examples/chart3D/CategoryExample.h
/usr/lib/Wt/examples/chart3D/ColorMapTest.h
/usr/lib/Wt/examples/chart3D/CsvUtil.C
/usr/lib/Wt/examples/chart3D/CsvUtil.h
/usr/lib/Wt/examples/chart3D/DataSettings.C
/usr/lib/Wt/examples/chart3D/DataSettings.h
/usr/lib/Wt/examples/chart3D/Models.C
/usr/lib/Wt/examples/chart3D/Models.h
/usr/lib/Wt/examples/chart3D/NumericalExample.C
/usr/lib/Wt/examples/chart3D/NumericalExample.h
/usr/lib/Wt/examples/chart3D/Tabs.C
/usr/lib/Wt/examples/chart3D/Tabs.h
/usr/lib/Wt/examples/chart3D/chart3D
/usr/lib/Wt/examples/chart3D/chart3D.C
/usr/lib/Wt/examples/chart3D/chart3D.wt
/usr/lib/Wt/examples/chart3D/configTemplates.xml
/usr/lib/Wt/examples/chart3D/hor_plane.csv
/usr/lib/Wt/examples/chart3D/isotope_decay.csv
/usr/lib/Wt/examples/chart3D/resources