Create them with the cartoonShader/create indicator
menu. Indicators are used to locally tweak the strokes
attributes:

Use
them for example if you want the strokes to be smaller or larger on
certain parts of an object ( a character's nose, for example) The
indicator basically multiplies the mapped shader attribute you
defined (attribute <map to> of a cartoon shader) by the value
you entered in the <multiplier> field.
There are also
4 decay functions (linear, smooth, square and square
root)
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