Fig. 7.

(a) Depth detection limit, $z_T^{\lim }$. (b) Optimum SD distance, ${\rho }^{\mathrm{opt}}$, as a function of $E(B_{\mathrm{amb}})+E(B_{\det })$ with varying ${\xi }_{\alpha }$ for case 1. Red, green, and blue colors indicate ${\xi }_{\alpha }=\mathrm{1,}2$, and 3, respectively. Because $E(B_{\det })$ was estimated at $˜1.25\mathrm{kcpb}$, the abscissa is almost equal to $E(B_{\mathrm{amb}})$.