Top panel: mean particle Lorentz factor at ωpet = 7840 for σ0 = 30. Middle panels: electron and positron x–px phase-space distribution dN/dxdydpx along the midplane integrated within y/de ± 75. Bottom panels: local particle spectra measured at four locations shown in the top panel and labeled from ① to ④. The dashed line is the total spectrum, and the dotted line is dN/du ∝ u−2.2 for reference.
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