Table 3.

Error estimation and standard deviation.

Method	Error		Standard Deviation
	skh 51	cc	skh 51	cc
400 MHz SAM	0.7%	0.7%	0.34%	1.2%
200 MHz SAM	0.5%	0.5%	0.15%	0.4%
Contact transducer	0.45%	0.5%	0.23%	0.24%