H-ZF72AGT by CDGM

$$n(\lambda) = \sqrt{1 + \frac{0.470479\,\lambda^2}{\lambda^2 - 0.0736025} + \frac{2.5504\,\lambda^2}{\lambda^2 - 149.307} + \frac{2.00593\,\lambda^2}{\lambda^2 - 0.0162999}}$$

$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-5.63 \times 10^{-6} + 2(1.59 \times 10^{-8})\,\Delta T + 3(-4.96 \times 10^{-11})\,\Delta T^2 + \frac{1.13 \times 10^{-6} + 2(1.73 \times 10^{-9})\,\Delta T}{\lambda - 0.328}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$