See also https://www.fourmilab.ch/documents/specrend/ https://www.fourmilab.ch/documents/specrend/ and implementation in several gradient formats at http://soli

See also https://www.fourmilab.ch/documents/specrend/ https://www.fourmilab.ch/documents/specrend/ and implementation in several gradient formats at http://soliton.vm.bytemark.co.uk/pub/cpt-city/jjg/physics/tn/bbrad.png.index.html http://soliton.vm.bytemark.co.uk/pub/cpt-city/jjg/physics/tn...