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How steep that power law is and how high it extends is not settled.","posed_since":"","precise":"For relativistic pair-plasma or electron-ion reconnection with magnetization $\\sigma = B^2/(4 \\pi w)$ ($w$ = relativistic enthalpy density) from 1 to 1e3, determine the index $p$ of dN/dgamma ~ gamma^-p and the high-energy cutoff $\\gamma_{\\max}$ as functions of $\\sigma$, guide field and system size $L/d_e$ in 3D, in the limit $L/d_e$ going to infinity. An answer is $p(\\sigma, B_g)$ and the scaling of $\\gamma_{\\max}$ with $L$, converged in system size.","problem_ref":null,"references":"","settled_by":"3D particle-in-cell simulations converged in system size, with an analytic acceleration model reproducing $p\\ \\text{and}\\ \\gamma_{\\mathrm{max}}$.","status_note":"Particle-in-cell work through 2025 finds $p$ approaching $1 \\text{ to } 2$ at $\\sigma$ much larger than 1, but convergence with system size and the role of 3D effects are disputed.","title":"Power-law index and cutoff of particles accelerated by 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