Mac Opera font settings in preferences editor

Curiosity

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In the preferences editor for Opera, the font settings are numbers separated by commas for each type of element. The first number is the font size, but what are the others?
Example - setting for Toolbar:
16,4,0,0,0,0,Helvetica Neue
The 16 is the font size. What is the 4, and what are the zeros?
 
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