Screenshots from the Python Simulator:

This is a field simulation of one single charge (q=1e-9 Coulombs (1 nanocoulomb))

This is a field simulation of two charges, (q1=1e-9 Coulombs), q2=-(1e-9 Coulombs), with a distance of forty meters

A gaussian sphere of charge (q=10 Coulombs) radius (5) and probe at (1,0,0)

A delta cluster at charge (q=10 Coulombs). Here, remember this is cosmetic to represent dirac delta, graphically it is just an infinitely tall spike from the middle

This is the gaussian sphere mode inside of the Browser version, charge (q=1 nanocoulomb), radius (5) and probe at (1,0,0):