Question: plot

Question:plot

I got an expression: R:=(2*E-2*sqrt(E)*sqrt(E-V0)-V0)/(sqrt(E)+sqrt(E-V0))^2; I would like to plot R as a function of E/V0. I tried to substitute E=mu*V0 to R, then plot(R,mu=0.1..1),but failed to get the plot. How can I get the right figure? thanks.
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