The geom behind geom_slice() when band is requested: a translucent
ribbon between the two edge slices, with each edge drawn as an ordinary
slice line. Like GeomSlice, alpha styles the ribbon, not the lines.
The geom behind geom_slice() when band is requested: a translucent
ribbon between the two edge slices, with each edge drawn as an ordinary
slice line. Like GeomSlice, alpha styles the ribbon, not the lines.