Table 3. Pressure Decrease at Steering Locations Furthest from Geometric Focus through the Skullcaps.

The percentages for the average pressure decrease, across the three skullcaps, at −20 and +20 mm for each axis relative to the geometric focal pressure.

Frequency	Sagittal		Coronal		Axial
	−20 mm	+ 20 mm	−20 mm	+20 mm	−20 mm	+20 mm
250 kHz	38±4%	28±4%	34±2%	34±3%	50±1%	17±2%
500 kHz	80±7%	63±4%	68±4%	69±7%	70±5%	36±3%