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@r-w,
You can use viewportMinimum and viewportMaximum properties of axisY and set it to 0 and 99 respectively so that any value above 99 or below 0 are not visualized. Kindly take a look at this code-snippet for an example on your requirement,
axisY: { viewportMinimum: 0, viewportMaximum: 99 }
You can take a look at this JSFiddle for an example with complete code on the same.
If the solution suggested doesn’t fulfill your requirement, kindly brief us further about your use case with a pictorial representation or an example so that we can understand your scenario better and help you out with an appropriate solution.
— Adithya Menon Team CanvasJS