Table 7.

Sensor coordinates and the first arrival times.

Sensor No.	Sensor coordinates/m			The first arrive time/ms
	X	Y	Z
9	8761	6614	522	34.9
21	8737	6609	565	36.6
5	8666	6600	520	39.3
17	8668	6599	565	41.1
4	8641	6515	520	42.3
8	8691	6684	520	44.5
2	8721	6449	520	47.8
26	8702	6604	647	50.0