[R] Change Axis Size

[webb at stats.ox.ac.uk]

Sorry if this is an obvious question but I have not been able to find the
answer.
I wish to plot 3 lines on the same plot. However, whichever one I plot
first, the axis does not have a big enough range for the other two to be
shown in the plot (they get cut off at the top and the bottom). Is there a
way to change the range of the y-axis when adding a new line to the plot?

Thank you,

Alex