@gauri,
How we can set the same width to the line even if data points are zero?
Can you kindly create JSFiddle with your use-case and share it with us along with more briefing about your requirements so that we can understand your scenario better and help you out?
How we can set a combination graph (2 y-axes) grids as equidistant?
You can achieve this by syncing the range of both the axes with the help of set method as shown in this JSFiddle.
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Manoj Mohan
Team CanvasJS