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Fig. 7. —Graph shows ratio of probe-guide time to freehand time
plotted against time averaged over probe-guided and freehand techniques for
all 80 targets. Horizontal line indicates a ratio of 1—that is, equal
time for freehand and probe-guided techniques. Points below line are targets
for which operator was quicker using probe guide, and points above line are
targets for which operator was quicker using freehand method.
