Table 2. Regression results for sensitivity as a function of depth.

SD	Model	Coef.	Std.			95% Conf. Interval		N	Sensitivity at Depth (mm)
Sep.	Param	Value	Err.	T	p	Low	High	Adj. R2	0	5	10
5	a	0.0000	0.0001	−0.6	0.550	−0.0002	0.0001	378
	b	0.0058	0.0003	19.3	0.000	0.0052	0.0064	0.526	0.58%	0.19%	0.06%
	c	0.8042	0.0185	43.4	0.000	0.7678	0.8406
10	a	−0.0001	0.0001	−0.7	0.491	−0.0004	0.0002	399
	b	0.0133	0.0005	25.3	0.000	0.0123	0.0143	0.647	1.32%	0.48%	0.17%
	c	0.8176	0.0132	62.1	0.000	0.7917	0.8435
15	a	−0.0002	0.0003	−0.7	0.458	−0.0007	0.0003	399
	b	0.0261	0.0009	27.8	0.000	0.0243	0.0280	0.687	2.59%	1.00%	0.38%
	c	0.8292	0.0113	73.6	0.000	0.8071	0.8514
20	a	−0.0003	0.0004	−0.9	0.392	−0.0011	0.0004	399
	b	0.0431	0.0013	32.7	0.000	0.0405	0.0457	0.753	4.27%	1.74%	0.70%
	c	0.8377	0.0091	91.8	0.000	0.8198	0.8557
25	a	−0.0005	0.0005	−1.0	0.341	−0.0015	0.0005	399
	b	0.0614	0.0017	36.5	0.000	0.0581	0.0647	0.793	6.09%	2.59%	1.09%
	c	0.8448	0.0078	107.8	0.000	0.8294	0.8602
30	a	−0.0006	0.0006	−1.1	0.276	−0.0018	0.0005	399
	b	0.0781	0.0019	41.6	0.000	0.0744	0.0818	0.832	7.74%	3.37%	1.44%
	c	0.8483	0.0067	125.7	0.000	0.8350	0.8616
35	a	−0.0008	0.0006	−1.2	0.221	−0.0020	0.0005	399
	b	0.0913	0.0020	45.8	0.000	0.0873	0.0952	0.857	9.05%	4.01%	1.75%
	c	0.8514	0.0060	141.5	0.000	0.8395	0.8632
40	a	−0.0009	0.0006	−1.3	0.182	−0.0021	0.0004	399
	b	0.1018	0.0021	49.3	0.000	0.0977	0.1059	0.875	10.09%	4.51%	1.99%
	c	0.8528	0.0055	154.1	0.000	0.8419	0.8637
45	a	−0.0009	0.0007	−1.4	0.165	−0.0022	0.0004	399
	b	0.1095	0.0021	51.5	0.000	0.1054	0.1137	0.883	10.86%	4.89%	2.17%
	c	0.8542	0.0053	162.3	0.000	0.8438	0.8645
50	a	−0.0010	0.0007	−1.4	0.163	−0.0023	0.0004	399
	b	0.1157	0.0022	52.7	0.000	0.1114	0.1200	0.889	11.47%	5.20%	2.33%
	c	0.8554	0.0051	167.9	0.000	0.8454	0.8655
55	a	−0.0010	0.0007	−1.5	0.134	−0.0024	0.0003	378
	b	0.1231	0.0022	54.8	0.000	0.1187	0.1276	0.901	12.21%	5.45%	2.40%
	c	0.8528	0.0050	171.2	0.000	0.8430	0.8626
60	a	−0.0011	0.0007	−1.5	0.132	−0.0025	0.0003	378
	b	0.1264	0.0023	56.0	0.000	0.1219	0.1308	0.905	12.53%	5.65%	2.52%
	c	0.8545	0.0048	176.9	0.000	0.8450	0.8640
65	a	−0.0011	0.0007	−1.6	0.112	−0.0025	0.0003	357
	b	0.1321	0.0023	57.6	0.000	0.1275	0.1366	0.914	13.09%	5.81%	2.54%
	c	0.8518	0.0048	178.6	0.000	0.8425	0.8612