C

n=1.5130-0.003169*pow(x,2)+0.003962*pow(x,-2)

Python

n=1.5130-0.003169*x**2+0.003962*x**-2

Fortran

n=1.5130-0.003169*x**2+0.003962*x**-2

MATLAB

n=1.5130-0.003169.*x.^2+0.003962.*x.^-2

LaTeX

n=1.5130-0.003169λ^{2}+0.003962λ^{-2}