[softwarelist] Leading calculation for lines of differing sizes

Hello, David,

When using relative leading between lines of differing sizes, I note that (for 
Homerton Medium font) the actual leading is the given percentage of the size of 
the line above the leading plus approximately 0.225 * ( size of line below - 
size of line above ).  Is this how the leading is calculated?  If so, is the 
0.225 (a) correct, (b) universal for all fonts and sizes and (c) arbitrary - or 
does it have some deep mystical significance? 

Regards
John Grogan

PS: I couldn't find any reference to the subject in the manual but I did notice 
a couple of typos in the section about relative leading.  In the first 
paragraph, it says that the line spacing is 45pt + 20% of 54pt (instead of 
45pt) and in Fig 5.7 it shows the results of this calculation as 54.09pt 
(instead of 54pt).

John Grogan

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