R help - May 2009 - expression(paste with the superscript in bold font

Hi,

I`m trying to put my superscript type in bold style. Could somebody help me?

My text is inside a barplot.

#!/bin/Rbarplot(x, ylab=expression(paste("org.", cm^-2)))

# so I tried this way,

*barplot(x, ylab=expression(bold(paste("org.", cm^-2))))* # but my
superscript maintain its shape in regular font type.

Thank you all.

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