Ejs Open Source 2 Mass Model with Gravity Field Vector, Field Lines, Potential Visualization.
author: Fu-Kwun Hwang and slightly edited by lookang

reference:
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=539.0
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1968.0

re-purposed from charge to mass by
m1 = -q1;
m2 = -q2;

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