Table 2:

Mean and standard deviation (SD) of peak pressure (in kPa) measured in the free field for each exposure level, and the gain in peak pressure level for each sensor relative to the free field pressure gauge (in dB re: free field). Abbreviations defined in Table 1.

		Peak Pressure (kPa)		Gain (dB re: free field)
		Field		FSurf	Surf	EAC	SV	ST	ME
7 kPa	Mean	7.59		+2.7	+0.3	+3.9	2.7	−2.5	−3.1
	SD	1.89		1.7	1.4	5.3	5.3	5.3	6.9
	N	16		16	16	14	13	13	11
28 kPa	Mean	31.19		+4.8	+1.3	+4.8	−4.6	−5.1	−8.0
	SD	3.10		1.4	1.5	6.9	6.2	6.5	9.3
	N	14		14	14	12	11	11	9
55 kPa	Mean	57.50		+4.3	+1.4	−0.6	−0.5	−0.6	−11.5
	SD	4.46		0.6	1.7	5.8	2.1	4.2	17.5
	N	6		6	6	4	4	4	4
83 kPa	Mean	92.63		+4.6	−9.5	−6.4	−6.5	−6.0	−7.3
	SD	1.82		2.5	13.3	3.0	5.0	6.6	1.2
	N	6		6	6	6	5	5	3