No of letters examined in the questioned group % on the total of letters examined % of correct signals of error for letter heights letters resulting most suited to trigger a correct signal of error
a 246 19,08 16,13  
b 16 1,24 -1,82  
c 50 3,88 15,79  
d 32 2,48 0,00  
e 96 7,45 15,36  
g 25 1,94 20,00  
i 158 12,26 23,16 4th
l 57 4,42 42,80 2nd best
m 5 0,39 0,00  
n 148 11,48 26,61 3rd
o 150 11,64 14,61  
r 123 9,54 0,30  
s 21 1,63 12,50  
t 67 5,20 49,09 Best
U 13 1,01 27,27  
V 17 1,32 8,33  
Z 65 5,04 12,22  
Total 1289 100    
Table 6: Letters most suited to trigger height errors.