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    @tdy I am wrong, what I said. That is the solution. Thank you very much. You can write this as an answer and I will mark it as solved. It seems that s has no lower boundary?
    – len
    Commented Mar 18, 2022 at 22:22
  • No problem. Any float is valid (even negative values will only give a warning), so the practical lower bound is just whatever is perceptible to the eye for a given figure.
    – tdy
    Commented Mar 18, 2022 at 22:58