E(x)=-70*exp(-x/0.2)
m(x)=0.01/(x**2)
set xlabel "Distance"
set ylabel "Energy"
set title "Energy functions of the Neutron Proton interaction"
plot [x=0:0.2] [-70:50] E(x) title "U(r) = -ke^(-r/a)", m(x) title "M(r) = l^2/(2mr^2)", E(x) + m(x) title "U'(r) = U(r) + M(r)", 25 notitle, -25 notitle