Technical data for this type of fractal : click here. For the factal here : fn1 = ident(), fn2 = log(), fn3 = tanh(), fn4 = cotanh() real(p1) = 8, imag(p1) = 16, real(p2) = 1, imag(p2) = 1, real(p3) = 2, imag(p3) = 2