The 'plot' function shows the evolution of the total score for each candidate as well as the quota.
# S3 method for SafeVote.stv
plot(x, xlab = "Count", ylab = "Preferences", point.size = 2, ...)
graphics object, with side-effect in RStudio's Plots pane
stv results
axis labels
diameter of elected/eliminated points
params for generic plot()