Euler poles derived from the inversion for five models as explained in the text. The first named plate moves counter-clockwise relative to the second plate. All maps are produced with the same projection area. (a) SCO–SAM rotation poles. For model PW-1, the SAM–SCO pole is shown (indicated by the white triangle). (b) SCO–ANT rotation poles, also shown in the inset. For model PW-1 the ANT–SCO pole is shown by the white triangle. (c) SAN–ANT rotation poles. (d) SAN–SCO rotation poles. (e) SAN–SAM rotation poles.