Quality of the NLFF solutions. From top to bottom for the individual ARs, we show: the volume-averaged current-weighted angle, ⟨θ_J⟩, the ratio of nonsolenoidal-to-total magnetic energy, E_div/E, the ratio |E_mix|/E_J, s, and its resolution-invariant complement, ⟨|f_d|⟩. Red, blue, and green colors correspond to bin1, bin2, and bin4 data, respectively, with inherent plate scales of ∼0.36, ∼0.72, and ∼1.4 Mm. Empty symbols mark disqualifying NLFF solutions (see Sect. 3.1 for explanation). The inlets in the rightmost column show a subrange of values for enhanced visibility. Vertical bars indicate the impulsive phase of X-class flares that occurred during the analyzed time intervals.