How are sub/superscripts designated for text in axis labels?  As in  
this y-axis label:

	scale_y_continuous("Respiration, pmol O2 h-1")

where the "2" needs to be subscripted and the "-1" needs to be  
superscripted.

Thanks.

Adam

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Adam G. Marsh, Ph.D.
Associate Professor
Marine Biological Sciences
University of Delaware
Lewes, DE 19958
302.645.4367
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