When you generate plots in R with the \'plot\' command, and set the left side x-axis limit to zero, with, e.g.
plot(x=c(1:10), y=c(1:10), xlim=c(0,10), ylim=
In calls to plot(), both xlim and ylim are by default padded (extended) by 4%. To suppress this behavior, set xaxs = "i" and/or yaxs = "i".
plot()
xlim
ylim
xaxs = "i"
yaxs = "i"
For more details, see the help page for par.
plot(x=c(1:10), y=c(1:10), xlim=c(0,10), ylim=c(0,10), xaxs="i", yaxs="i")