Table 1. Median values and i-percentiles, Pi, of the unsigned error obtained in the estimation of the compression depth for each method.

Values are expressed in mm. LF: linear filtering; ZCV: zero-crossing velocity; SA: spectral analysis.

	Median	P25	P75	P90	P95
LF	3.1	1.5	5.4	8.5	11.2
ZCV	3.4	1.5	6.0	9.5	12.9
SA	1.3	0.6	2.3	4.0	5.9