Table 1. Comparison of SNR mean (standard error) at each depth for sample exposure times of 1.89 and 5.66 seconds, using identical excitation power for each method per depth.

	1.89 s		5.66 s
Depth (µm)	GG	RG	GG	RG
250	46 (3)	44 (3)	67 (4)	72 (5)
500	36 (3) a	26 (2) a	58 (6)	44 (5)
750	20 (3) a	14 (1) a	33 (3) a	23 (2) a

^a GG scanning yielded higher SNR than RG scanning (p < 0.05, paired t-test)