Table 2. Measured localization precisions. The CRLB-derived theoretical minimum values are stated in brackets. The numbers are in nanometers.

	${\overline{\sigma }}_x$	${\overline{\sigma }}_y$	${\overline{\sigma }}_z$
DEF	13 (13)	13 (11)	19 (18)
CYL	10 (8)	14 (11)	16 (16)
BIP	12 (9)	11 (8)	14 (13)