What does 'range' do: abGate plug-in?

I like the abGate plug-in. I’m trying to fine tune it to my source material.
Most of the settings are self explanatory, but what does the ‘range’ value do?

Is there any documentation of this plug-in outside of the Mod environment?

https://abgate.sourceforge.io/ is official website, but not much information there.

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