alluvial() exposes mar argument that is passed to par() so the user can customize the plot margins (which are rather narrow by default) (#31).alluvial() has two new arguments xlim_offset and ylim_offset which are passed to xlim and ylim of plot(). This enables adjusting the size of the plotting region and avoid label clipping in some cirumstances (#32)vignette("alluvial", package="alluvial") illustrating basic usage of alluvial(). The vignette needs dplyr package so it is now Suggested..Rmd file. Some typos fixed.First release.