GeomSankeynode          Bars representing nodes in a Sankey diagram
GeomSankeysegment       Sankey edges (flows)
PositionSankey          Position nodes and edges in a Sankey diagram
StatSankeyedge          Sankey stats
draw_key_sankeyedge     Key glyphs for legends
ecosystem_services      Data on risks to supply ecosystem services
pivot_stages_longer     Pivot wide data to long for plotting as Sankey
scale_waist_continuous
                        Sankey edge waist line scales
