The dimensions of the symbol are calculated with the parameters
"Isolate", "Conduct", and "Gap" along with the drill diameter:
Inner diameter = D + 2 * C
Outer diameter = Inner diameter + 2 * I
Gap = width of the conducting paths in
the thermal symbol
Default: 20 [Mil]
(only relevant with emulation)
where: D = drill diameter
C = Conduct (Default: 20 [Mil])
I = Isolate (Default: 10 [Mil])
With the default settings thermal symbols with a conducting ring of 20
Mils width are generated. The isolation lines are 10 Mils wide and
leave conducting paths of 20 Mils width.
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