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How can I read min and max value of autoranged axis upon chart loading?

I set my axis to “autorange”, so the “range” property is not available, and anyway properties of layout object are not updated upon plotting data.

So how can I know which min and max values have been set after the plot is plotted?

I am plotting a 3d chart with kilometers on the axes, and I want to draw a circle in the origin, with a specific radius expressed in km, so I think I need to know how many kms fit into a known-sized canvas to get the right radius in pixel… Is this correct?