Fig. 4

Arai plot illustrating successful paleointensity determinations using the IZZI protocol (in-zero and zero-in field steps are indicated by the solid and open circles, respectively). pTRM checks (triangles) reproduce the origin pTRM within 5%. The insets are shown orthogonal vector plots, with solid symbols corresponding to horizontal planes and open symbols corresponding to vertical planes, extracted from the zero-field steps and representative thermal demagnetization patterns