There are six directions along which the square of the Weyl tensor (the "Kretschmann" scalar) need not diverge. The values of this scalar shown are 5, 1, 0.05, 0.005, 0.0005, 0, -0.005, -0.0368, -1, -5. The diagram holds for all Kerr balck holes (x=r/a, a is not zero).