Fig. 5.

Three search paths to illustrate the best R and the standardized angle. (a) An efficient search, starting on the left of the field and proceeding in a general rightward direction, results in a high correlation between the cancellation rank number and the horizontal cancellation position. (b) An inefficient search has no general direction, and leads to low correlations between the cancellation rank number and both the horizontal and vertical cancellation position. (c) Another efficient search path, resulting in a lower best R, but a high standardized angle. (d-f) Best R plots of cancellation paths a-c