Value of B-integral for material of given thickness $z$, wavelength of radiation and position-independent (maximal) intensity $I_{\max }$: $$B=\frac{2\pi }{\lambda }\underset{0}{\overset{z}{\int }}{n}_{2}I(z)\mathrm{d}{z}^{\prime }=\frac{2\pi n_2{I}_{\max }z}{\lambda }.$$ Reported values of nonlinear refractive index $n_2$ at the corresponding wavelenghts given below. For wavelenghts in the given range, value of $n_2$ is interpolated. For wavelenghts outside the region, $n_2$ at the closest wavelength is used.