Fig. 6.

Invariant energy spectrum of neutral pions, $x_{E}d{\sigma }_{pp}^{{\pi }^0}/d{x}_{\text{F}}$, in c.m. frame for pp-collisions at $\sqrt{s}={10}^2$, 10³, and 10⁴ GeV – solid, dashed, and dashed–dotted lines respectively. Dotted line corresponds to a rescaling of the spectrum from $\sqrt{s}={10}^2$ GeV to $\sqrt{s}={10}^4$ GeV, according to the rise of the height of the central rapidity plateau.