Try: mtext(eval(parse(tex=paste("expression(mu[", colnames(PresEsts)[2],"])", sep=""))),side=2,at=max(y)-15,las=1)
-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
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