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Fig. 28.

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Anisotropy of the composition. Top: scatter plot showing the value of ⟨lnA⟩ in a pixel as a function of the number of events in the pixel for the skymap displayed on the top panel of Fig. 27 divided into 192 pixels of equal area. Center: average distribution (over 300 datasets) of in the high and low count pixels (see text) for the events with E ≥ 8 EeV, for the scenario considered in Fig. 27, the shaded areas show the interval in which 90% of the datasets are found. The value of Xmax is assumed to be measured for 10% of the events (that is in average for 6500 events per dataset). Bottom: scatter plot of the difference in ⟨lnA⟩ as a function of between high and low pixel counts for the 300 datasets corresponding to the scenario considered in Fig. 27. The different red and blue colors shows cases for which the value of Xmax and lnA is known respectively for 10% and 100% of the events.

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