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Fig. 6.

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FWHMmin versus (1 + z) (left panel) and T90 versus (1 + z) (right panel) for the Swift sample as seen in the observer frame. Red (blue) dots correspond to LGRBs (SGRBs). Lighter dots refer to individual GRBs; darker ones refer to T90 geometrical mean of groups of 30 (6) LGRBs (SGRBs), sorted with increasing z.

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