Numerical data for Fig.2E of Horinouchi et al (2020), Science Latitude, Thick curve -50.250000, -0.0172263 -47.250000, -0.016076 -44.250000, -0.0122529 -41.250000, -0.00910786 -38.250000, -0.00607709 -35.250000, -0.00472275 -32.250000, -0.0036191 -29.250000, -0.00278612 -26.250000, -0.00214794 -23.250000, -0.00162802 -20.250000, -0.00122073 -17.250000, -0.000849216 -14.250000, -0.000543914 -11.250000, -0.000333172 -8.250000, -0.00017249 -5.250000, -6.83208e-05 -2.250000, -5.4147e-06 0.750000, -1.30061e-05 3.750000, -0.000100711 6.750000, -0.000259017 9.750000, -0.000442257 12.750000, -0.000630973 15.750000, -0.000857091 18.750000, -0.00111812 21.750000, -0.00146476 24.750000, -0.00190204 27.750000, -0.00227402 30.750000, -0.00273434 33.750000, -0.00338718 36.750000, -0.004142 39.750000, -0.00557572 42.750000, -0.0082916 45.750000, -0.0116795 48.750000, -0.0178104 51.750000, -0.0266161 Latitude, Thin curve -50.250000, -0.0239682 -47.250000, -0.0158784 -44.250000, -0.0127578 -41.250000, -0.00936244 -38.250000, -0.00650086 -35.250000, -0.00493644 -32.250000, -0.00384252 -29.250000, -0.00298074 -26.250000, -0.00230268 -23.250000, -0.00172543 -20.250000, -0.00128284 -17.250000, -0.000904559 -14.250000, -0.00058997 -11.250000, -0.000362122 -8.250000, -0.000184147 -5.250000, -6.94168e-05 -2.250000, -4.27388e-06 0.750000, -1.85949e-05 3.750000, -0.000120945 6.750000, -0.000298144 9.750000, -0.000500464 12.750000, -0.000722794 15.750000, -0.000989597 18.750000, -0.00129088 21.750000, -0.00167747 24.750000, -0.00216697 27.750000, -0.00262531 30.750000, -0.00315518 33.750000, -0.00392136 36.750000, -0.00509915 39.750000, -0.0069265 42.750000, -0.00988568 45.750000, -0.013577 48.750000, -0.0197772 51.750000, -0.0282247