/usr/share/dx/samples/programs/PLOTTING/ is in dxsamples 4.2.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dx/samples/programs/PLOTTING/Categorical.cfg
/usr/share/dx/samples/programs/PLOTTING/Categorical.net
/usr/share/dx/samples/programs/PLOTTING/GroceryList.cfg
/usr/share/dx/samples/programs/PLOTTING/GroceryList.net
/usr/share/dx/samples/programs/PLOTTING/Histogram.cfg
/usr/share/dx/samples/programs/PLOTTING/Histogram.net
/usr/share/dx/samples/programs/PLOTTING/InterfaceControl2.cfg
/usr/share/dx/samples/programs/PLOTTING/InterfaceControl2.net
/usr/share/dx/samples/programs/PLOTTING/PickPlot.cfg
/usr/share/dx/samples/programs/PLOTTING/PickPlot.net
/usr/share/dx/samples/programs/PLOTTING/PlotGroupOfLines.cfg
/usr/share/dx/samples/programs/PLOTTING/PlotGroupOfLines.net
/usr/share/dx/samples/programs/PLOTTING/PlotLine.cfg
/usr/share/dx/samples/programs/PLOTTING/PlotLine.net
/usr/share/dx/samples/programs/PLOTTING/PlotLine2.cfg
/usr/share/dx/samples/programs/PLOTTING/PlotLine2.net
/usr/share/dx/samples/programs/PLOTTING/PlotSpecifyTicks.cfg
/usr/share/dx/samples/programs/PLOTTING/PlotSpecifyTicks.net
/usr/share/dx/samples/programs/PLOTTING/PlotTwoLines.cfg
/usr/share/dx/samples/programs/PLOTTING/PlotTwoLines.net
/usr/share/dx/samples/programs/PLOTTING/Sort.cfg
/usr/share/dx/samples/programs/PLOTTING/Sort.net
/usr/share/dx/samples/programs/PLOTTING/UsingBarChart.cfg
/usr/share/dx/samples/programs/PLOTTING/UsingBarChart.net
/usr/share/dx/samples/programs/PLOTTING/UsingEqualize.cfg
/usr/share/dx/samples/programs/PLOTTING/UsingEqualize.net