This is determined by multiplying the width of each lowercase character
by a constant, adding the products, and then dividing by 1000. The letters
involved in this, plus their constants, are as follows:
Letter
Constant
a
64
b
14
c
27
d
35
e
100
f
20
g
14
h
42
i
63
j
3
k
6
l
35
m
20
n
56
o
56
p
17
q
4
r
49
s
56
t
71
u
31
v
10
w
18
x
3
y
18
z
2
space
166
Note: For
fixed pitch fonts, this value will be the same as the (A width + B width
+ C width) escapement of each character.