/usr/share/tcltk/tklib0.6/plotchart/ is in tklib 0.6-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/tcltk/tklib0.6/plotchart/pkgIndex.tcl
/usr/share/tcltk/tklib0.6/plotchart/plot3d.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotanim.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotannot.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotaxis.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotbind.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotbusiness.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotchart.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotcombined.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotconfig.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotcontour.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotgantt.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotobject.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotpack.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotpriv.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotscada.tcl
/usr/share/tcltk/tklib0.6/plotchart/plotspecial.tcl
/usr/share/tcltk/tklib0.6/plotchart/plottable.tcl
/usr/share/tcltk/tklib0.6/plotchart/scaling.tcl
/usr/share/tcltk/tklib0.6/plotchart/xyplot.tcl