Table 3.

Summary of the experimentally determined values.

Experiment	Soft		Firm		Extra firm		Contrast ratios
	$\overline{\mu }$ (kPa)	σ (kPa)	$\overline{\mu }$ (kPa)	σ (kPa)	$\overline{\mu }$ (kPa)	σ (kPa)	Firm∕soft	Extra firm∕soft
MRPE (28.5 mm dia.)	4.614	2.264	10.611	3.058	14.153	2.606	2.30	3.07
MRPE (19.0 mm dia.)	4.477	2.080	9.396	3.420	14.109	4.142	2.10	3.15
MRPE (12.5 mm dia.)	4.782	2.437	5.127	2.934	7.119	3.645	1.07	1.49
Quasistatic	0.887	0.053	1.985	0.110	2.339	0.195	2.24	2.64
Viscoelastic (100 Hz)	6.368	0.390	16.051	0.663	21.889	1.846	2.52	3.44