Cross-section of g of Q1 (a - c) and Q2 (e - g) in the x - y plane (a, e), x - z plane (b, f) and y - z plane (c, g) of the magnet frame. Dots indicate measurements of g * and the solid line corresponds to the fit of g. Exemplary resonance spectra used to extract g are plotted in Supplementary Fig. 1.
