Thanks David for the solution, I paste here the code with a few changes:
par(xpd = NA, oma = c(5, 0, 0, 0))
matplot(t(buffersump[,1:6]), type="l", xaxt="n", lwd=3, ylab="Porcentajes de
respuestas afirmativas")
axis(1, 1:6, colnames(buffersump2))
legend("bottomright", legend=rownames(buffersump2), lty=1:5, col=1:5, inset
= c(0, -0.7))
--
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