Fig. 17
Surface density of REFLEX II clusters in the sky as a function of the interstellar hydrogen column density, nH. The dashed line shows the distribution of nH-values in the REFLEX region for comparison. The dotted line shows the mean value of 0.068 degree. Note that the regions with a flux limit smaller than the nominal flux limit have been scaled to a smaller effective area as explained in the text. The last bin contains all regions with nH > 1021 cm.
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