But when I copy the function (named "Plot") from that example to my code, I get the compiler error "no suitable method found". And error code (CS0115) is referenced and linked, but the link contains no help (and says so when you follow it).
The letter "P" in the name of the copied function is flagged by the compiler.
I have looked for a declartion or other reference to this function in the sample code, but if there is one I can't see it. What am I missing?

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