plot y=1+0.05792105/(238.0185-x^-2)+0.00167917/(57.362-x^-2); y=sqrt(1+4.915889e-4 x^2/(x^2-4.352140e-3)+5.368273e-5 x^2/(x^2-1.747001e-2)-1.949567e-4 x^2/(x^2-4.258444e3)); x=0.2 to 1.7