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There is a tendency in both (a) and (b) toward overestimation 
within thirty-five feet. Beyond that distance the opposite tend- 
ency prevails. 
These facts are shown to better advantage in the direction of the 
following curves. The dotted line represents the average in (a), 
the broken line that in (b), and the unbroken line the general aver- 
age. The figures on the left side above the line marked. zero, 
represent percentages of overestimation, and those below it, per- 
