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Using two-dimensional particle-in-cell simulations, we characterize theenergy spectra of particles accelerated by relativistic magnetic reconnection(without guide field) in collisionless electron-positron plasmas, for a widerange of upstream magnetizations $\sigma$ and system sizes $L$. The particlespectra are well-represented by a power law $\gamma^{-\alpha}$, with acombination of exponential and super-exponential high-energy cutoffs,proportional to $\sigma$ and $L$, respectively. For large $L$ and $\sigma$, thepower-law index $\alpha$ approaches about 1.2.

The extent of power-law energy spectra in collisionless relativistic magnetic reconnection in pair plasmas