Energy spectra of electrons accelerated during t = 8 × 10⁻⁵ s in the coalescent islands with magnetic field magnitudes: panel a: B₀ = 100 G, and panel b: B₀ = 10 G: Both ξ_y = 0 (the blue dash-dotted line) and ξ_y = 1 (red lines) cases are compared in the same plot. Panel c: energy spectrum of electrons in squashed (“S”) islands (blue dash-dotted line) with ξ_y = 0. For comparison, the spectrum of the ξ_y = 0 case in panel a from coalescent islands (“C”) is also plotted as a background. The green dotted lines indicate the initial thermal distribution with T₀ = 100 eV. The other parameters are as follows: E_y0 = 100 V m⁻¹, ϵ = 0.3, k = 0.03125, d = 2 m. We note that the dashed lines show only the referral power-law indexes in different cases and do not represent the whole fitting range of energies gained (up to three orders of magnitude on the plot).