External rays for angles of the form : n / ( 21 - 1)
(0/1; 1/1)
landing on the point c= 1/4,
which is cusp of main cardioid ( period 1 component)
images made with Mandel - program for DOS by Wolf Jung, version 3.5
see: http://www.iram.rwth-aachen.de/~jung/indexp.html
It is probably mathemathically most advanced program for drawing mandel / Fatou / Julia sets
Commands:
1< enter > ; q = 2 ; e = 0/1 < enter > ; F9 ; < end >
changed to grayscale, resized and converted to jpg using IrfanView
www.irfanview.com/
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