The following code produces the parse error
'Expected 'fractal keyword', float function 'tan' found instead.

According to the docs (6.5.1.6) tan is a valid function for julia fractals
all the other trig functions (sin, cos, asin, acos, sinh, cosh, asinh,
acosh, tanh,
atan and atanh) work fine

julia_fractal {
   <-0.1,-0.2,-1,-0.025>
   hypercomplex
   tan
   max_iteration 7
   precision 20
   pigment {rgb <0,0,1>}
  }

Gail
--
#macro G(H,S)disc{0z.4pigment{onion color_map{[0rgb<sin(H/pi)cos(S/pi)*(H<6)
cos(S/pi)*(H>6)>*18][.4rgb 0]}}translate<H-5S-3,9>}#end G(3,5)G(2,5.5)G(1,5)
G(.6,4)G(.5,3)G(.6,2)G(1,1)G(2,.5)G(3,.7)G(3.2,1.6)G(3.1,2.5)G(2.2,2.5)G(9,5
)G(8,5.5)G(7,5)G(7,4)G(7.7,3.3)G(8.3,2.7)G(9,2)G(9,1)G(8,.5)G(7,1)//GS

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