H-ZK10L by CDGM

$$n(\lambda) = \sqrt{1 + \frac{0.957266\,\lambda^2}{\lambda^2 - 100.409} + \frac{1.44528\,\lambda^2}{\lambda^2 - 0.0080438} + \frac{0.143179\,\lambda^2}{\lambda^2 - 0.0304353}}$$

$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-7.67 \times 10^{-7} + 2(1.58 \times 10^{-8})\,\Delta T + 3(-1.87 \times 10^{-11})\,\Delta T^2 + \frac{4.79 \times 10^{-7} + 2(2.46 \times 10^{-10})\,\Delta T}{\lambda - 0.2}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$