D-ZF10 by CDGM

$$n(\lambda) = \sqrt{1 + \frac{0.181091\,\lambda^2}{\lambda^2 - 0.0606386} + \frac{1.38322\,\lambda^2}{\lambda^2 - 132.947} + \frac{1.57814\,\lambda^2}{\lambda^2 - 0.0122919}}$$

$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.76 \times 10^{-6} + 2(6.62 \times 10^{-9})\,\Delta T + 3(-3.57 \times 10^{-11})\,\Delta T^2 + \frac{9.8 \times 10^{-7} + 2(1.12 \times 10^{-9})\,\Delta T}{\lambda - 0.261}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$