Each bag containing aliquots was fastened horizontally inside
the water tank of the shock wave generator and positioned so that
the focus F was centered inside the bag (Fig. 2). The error in positioning
the bags was estimated to be ±0.5 mm. The water level was
set 80 mm above F. A total of 48 bags were prepared and eight
treatment conditions were tested (Table 1): Bags in group 1 were