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Fig. 1
Slope of the gamma-ray spectrum produced by pp collisions in the energy band 1−10 GeV for n0 = 1 cm-3 (solid lines) and n0 = 0.1 cm-3 (dashed lines). From top to bottom, the lines for each case refer to neutral fraction fN = 0.8, 0.7 and 0.6.
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