Technical data for this type of fractal : click here. For the factal here : fn1 = ident(), fn2 = ident(), fn3 = ident(), fn4 = cotan() real(p1) = 5, imag(p1) = 7, real(p2) = 1, imag(p2) = 1, real(p3) = 1, imag(p3) = 1