scale_size for
more information. The different geoms will know whether to use edge scales or
the standard scales so it is not necessary to write edge_size in
the call to the geom - just use size.
scale_edge_size_continuous(..., range = c(1, 6))
scale_edge_radius(..., range = c(1, 6))
scale_edge_size(..., range = c(1, 6))
scale_edge_size_discrete(..., range = c(2, 6))
scale_edge_size_area(..., max_size = 6)
scale_edge_size_manual(..., values)
scale_edge_size_identity(..., guide = "none")continuous_scale
to control name, limits, breaks, labels and so forth.na.value.Scale
scale_edge_alpha,
scale_edge_colour,
scale_edge_fill,
scale_edge_linetype,
scale_edge_shape,
scale_edge_width,
scale_label_size