Left panel: vs. (1 + z) (dots). Dashed contours denote constant fluences (in units 10-7 erg/cm2): I. the maximal fluence, i.e. 1050; II. 105; III. 10.5; IV. the minimal fluence, i.e. 0.68. Right panel: vs. (1 + z) (dots). Dashed contours denote constant peak-fluxes (in units ph cm-2 s-1): I. the maximal peak-flux, i.e. 71; II. 7.1; III. 0.71; IV. the minimal peak-flux, i.e. 0.04. The objects below a curve at smaller redshifts together with those at higher redshifts and above the curve illustrate the inverse behaviour.
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