Graph the marginal effect of x1 on y (y-axis) against x2 (x-axis)?

Dear All, Suppose I run the following regression:

Code:

// ssc install interflex, interactplot
sysuse auto, clear
reg price c.mpg##c.weight

I am aware that (ssc install) interflex and interactplot can do the trick, but I'd like to do that manually. Note that both x1 (mpg) and x2 (weight) are continuous.Any suggestions are highly appreciated.

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