Cluster density distribution as a function of redshift in the zone of avoidance at |bII|< 20°. Filled symbols are for the region with a Galactic hydrogen column density of nH < 2.5 × 1021 cm−2 and open symbols for nH < 1.5 × 1021 cm−2. The cluster sample in these region is not complete and therefore the data provide a lower limit. The density distribution has been normalised by the expected cluster density based on the average luminosity function as explained in Sect. 3.
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