Where is bug? Expression is red

Your curve is not internalized.
No wires are connected to your Range output, or your Expression component, or the ‘B’ input of your Division component. :man_facepalming:

P.S. By the way, when the ‘Display | Draw Full Names’ option is used, the Expression component breaks (very old bug) because ‘Variable x’ and ‘Variable y’ don’t match the ‘x’ and ‘y’ used internally. The solution is to rename the inputs or avoid ‘Draw Full Names’.

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