Math - Intuitive Divergence

On this page we try to show an intuitive understanding of what Divergence is for a Vector Field. 

We use the idea of water, fluid, or a gas flowing thru a volume of space.  

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Calculate the Divergence of a Gravitational field between two point masses:  M0 and m1

Below is the Gravitational Field as Created by the Desmos On-Line Graph Application.
Shown in the X-Y Plane. Not all of the Desmos calculations are shown. 

Compute the Divergence of the Gravitational Field. 
Notice, that it is critical that three dimensions added together result in a zero numerator.