Dear R-mailing list,

I would like to overlay to two quantreg coefficients plots. I have
plot(summary(rq(ff~tipo,tau = 1:49/50,data=Spilldata)))
plot(summary(rq(ff~tipo,tau = 1:49/50,data=Spilldata1)))

Is there a possibility to display the two in the same graph?

Thank you so much!!!
Christian 

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