FIG. 8.

CRLB error using constant covariance formula ${\mathbf{C}}_{\mathbf{A},\mathbf{CRLB}}=\left({\mathbf{M}}^{\mathbf{T}}{\mathbf{C}}_{\mathbf{L}}^{-1}\mathbf{M}\right)$. The fractional error given by Eq. (B2) is plotted as a function of the mean number of counts for four values of the dead time parameter η. The top panel shows the error with three bin PHA while the bottom panel is for the NQ detector.