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Fig. 6

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Limitations to the parameters a0 and α from QSOs. The excluded regions are below the dotted-dashed or the solid line depending on whether the photons redshifted to the observer wavelenghts, were taken into account. The holographic model (α = 2/3) of space-time foam is preserved for a0 ≲ 5   10-2 and a0 ≲ 0.15 (upper panel). The random walk model (α = 1/2) is preserved for a0 ≲ 10-13 and a0 ≲ 10-12 (lower panel).

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