Gamma-ray spectra of the PWN, SNR, and ISM components at 10 kyr in a high-turbulence case, as a function of the maximum particle momentum $p_{\max }^{\mathrm{ST}}$ allowed in the remnant. The PWN emission is the same in all three runs since it is not affected by this parameter. The gray dotted line corresponds to an order-of-magnitude estimate of the pion-decay emission from cosmic rays in the remnant (see text for details).