Outcome of fitting EoR power spectra using Eq. (3). Left to right panels show the evolution of the best-fit values of the parameters A and γ and fitting error as a function of ${\overline{x}}_{\mathrm{HI}}$ for different reionization scenarios. It should be noted that here we have used Eq. (3) while we used Eq. (2) for Fig. 4. The reionization scenarios are the same as in Fig. 4. Bold lines correspond to the fiducial GRIZZLY reionization scenario.