Hello, there are so many topics about marginal effect using -margins- command.
But most of them talk about the significance level of estimation.
I would like to find the significance level of the difference between margins. I first run the command like this

margins, at(VAR1=(0 1) VAR2=(0.01(0.99)1))

Then I use marginsplot to have the figure output.

For example, I have the output plot like this.

Array
I would like to find:
Whether the difference between point A1 and A2 is significant?

Whether the difference between point B1 and B2 is significant?


How to find the significance level here?

Thank you very much.