plot() cuts off long tick labels

Is there any way of preventing tick label names from being cut off by
the plot canvas? Seems to happen every time:

http://a3.s3.p.quickshareit.com/files/validationb0e66.png

Thanks in advance.

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Chris Fonnesbeck
Department of Mathematics and Statistics
PO Box 56, University of Otago
Dunedin, New Zealand