a
1
= a
7
=–0.4755864
a
2
= a
8
=–0.9746302
a
3
= a
9
= 0.3264041
a
4
= a
10
=–0.0916340
a
5
=–a
11
=–0.3045827
a
6
= 0.21986
a
12
= 1.437308
critical centre
(–0.24579, 0.14860)
fixed point
(0.10468, 0.90646)
a1 = a7 =–0.4755864