

   MMeeaassuurreemmeennttss ooff FFoorreennssiicc GGllaassss FFrraaggmmeennttss

   AArrgguummeennttss::

         RI: refractive index; more precisely the refractive
             index is 1.518xxxx.

             The remaining 8 measurements are percentages by
             weight of oxides.

         Na: sodium

         Mg: manganese

         Al: aluminium

         Si: silicon

          K: potassium

         Ca: calcium

         Ba: barium

         Fe: iron

       type: The fragments were originally classed into seven
             types, one of which was absent in this dataset.
             The categories which occur are window float glass
             (`WinF': 70), window non-float glass (`WinNF':
             76), vehicle window glass (`Veh': 17), containers
             (`Con': 13), tableware (`Tabl': 9) and vehicle
             headlamps (`Head': 29).

   SSUUMMMMAARRYY::

        The `fgl' data frame has 214 rows and 10 columns.  It
        was collected by B. German on fragments of glass col-
        lected in forensic work.

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        This data frame contains the following columns:

