Fig. 2

Indices
normalized to
as
function of an exposure τ. The bold curve corresponds to the median
of γ12 = 0.938, the dashed line to the limit of the SE
regime γ12 = 0.870. Other curves are marked by appropriate
γ12. The upper horizontal line represents the lower
boundary of the SE regime, the lower horizontal line the upper limit of the LE
regime.
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