></code>: numeric variables <code>n</code>, <code>count</code>, and <code>prop</code>; and character variables <code>lode</code> (when the <code>alluvium</code> aesthetic is specified) and <code>flow</code> (when using the flow stat). The numerical variables can be weighted using the <code>weight</code> aesthetic, which is dropped during computation (so that it does not confuse the geoms), while <code>lode</code> is distilled according to a new <code>distill</code> parameter. This use of <code>weight</code>