Resulting χ² map of the X and Z scan for solar data using model A2 (upper panels), A3 (middle panel), and M2 (lower panels) in the procedure and using either SAHA-S v7 or SAHA-S v3. The orange and red crosses indicate the positions of the AAG21 model including rotation and magnetic fields and the MB22 standard solar model, respectively (values from their paper). The left panel is associated with the high-T subdomain for the Z determination, while the right panel is associated with the low-T subdomain used to determine X.