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Peter de Jong attractor
  x2 = sin(a * y1) - cos(b * x1)
  y2 = sin(c * x1) - cos(d * y1)

Coloured by:
  red:   abs(x2 - x1)
  green: abs(y2 - y1)
  blue:  1.0

Animated by:
  a = 4 * sin(t * 1.03)
  b = 4 * sin(t * 1.07)
  c = 4 * sin(t * 1.09)
  d = 4 * sin(t * 1.13)

animation speed	%
animate t
set from t a
set from t b
set from t c
set from t d
inner loop
brightness	%
gpu budget	ms
render scale	%
gpu ts res	ns
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