Four magnetograms that we use as input photospheric conditions for Event 4. Top left: HMI Synchronic; Top right: HMI Synoptic; Bottom left: GONG Zero-point corrected; Bottom right: GONG ADAPT Realization #10. The green vertical line indicates the Carrington longitude of the central meridian as seen from Earth. The dotted circle marks the approximate location of the CME source region. The gray curve marks the location of the heliospheric current sheet at 2.5 R_⊙. All maps are saturated to ±100 G, with red (blue) indicating positive (negative) polarity.