Supporting Data for Martian Dynamo Change at ~4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater

MAG_MAVEN_NIGHTTIME.txt contains magnetic field from MAVEN nighttime tracks across the study area;

TOPOGRAPHY_CRUST_AB.txt  contains the topography and crustal thickness data in Figure 2;

MAGNETIC_MODEL_CALCULATION.csv contains the normalized circumferential averaged magnetic field upon the impact crater with different diameters and internal magnetizations, which are calculated randomly one hundred times in each case.