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I am trying to add arrows marking specific x coordinates below the x axis in an R plot. My x axis is at y=0 and when I try to use negative y-coordinates in arrows, so the arrows will be perpendicular to x axis, I get only the very edges of the arrow plotted (although is some space, e,g where the x-axis label and tickmarks are plotted).
The xpd option can be used in arrows so you can just set your coordinates to be outside your plot region and set xpd to TRUE. For example, assuming xlim = c(0,10) and ylim = (0,10), and you set the x-axis to 0 then
draws a vertical arrow pointing up at the x-axis at position 1.4 on that axis.