Data point selection for weighted least square fitting of cavity decay time constant

He Xing^{1, 2, 3}, Yan Hu^{1, 2, 3}, Dong Li-Zhi^{1, 2}, Yang Ping^{1, 2}, Xu Bing^{1, 2, †,}

Comparisons of the WLS-DS method with the NLSF and the LRS methods. In panel (a), the NLSF and the LRS methods are both executed by using the selected data points of the WLS-DS method. The derivation of NLSF precision in panel (a) has been achieved by Ref. [12]. However, for the LRS method, its precision and accuracy are too complicated to give closed forms,^[12]so our presentation of the LRS method is based on simulations.Y-axes in panels (a) and (b) are in different ranges, which indicates Δτ_fitis smaller thanσ(τ_fit).