How evenly the magnetic field is distributed across all four measurement axes (x-, x+, y-, y+). A high symmetry score means the field strength is nearly identical in all directions from center. That indicates the coil produces a uniform, balanced output. A low score reveals directional bias where some axes are significantly stronger or weaker than others. The score is calculated by comparing each individual axis reading to the mean of all 4 axes at each distance, weighted by field strength (stronger readings count more). It uses a 15% floor (ignoring weak-field areas below 15% of peak) and a 15% deviation cap. Requires all 4 axes. Score = 100 minus weighted average deviation percentage.
Field symmetry checks how evenly the field spreads from the center. The report measures the field out along four axes and compares each one to their average at every distance. When the field reaches about the same strength in every direction, the four half-strength points fall on a near-perfect circle and the score is high; when one axis runs strong or weak, the ring pulls out of round.
