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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.

dynamic chart with viewportMinimum and viewportMaximum

Adithya Menon
Team CanvasJS