For the example involving two in-focus point sources in Section 20.5, the lower bounds δ sx and δ sy on the standard deviations for estimating the s x and s y coordinates of the midpoint between the...

For the example involving two in-focus point sources in Section 20.5, the lower bounds δ_sx
and δ_sy
on the standard deviations for estimating the s_x
and s_y
coordinates of the midpoint between the point sources are shown in Fig. B as functions of the distance d that separates the point sources. Provide an explanation for the patterns exhibited by δ_sx
and δ_sy
.