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Published online by Cambridge University Press: 12 April 2016
Some problems encountered in the homogenization of photometric data (especially for the uvby$ and UBV systems) are presented: sources of inhomogeneity, method to obtain a homogeneous photometric value, establishment of a reference list, etc.
In many cases a homogeneous photometric value is necessary, but cannot be simply an arithmetical mean, and for this purpose it is necessary to make a critical evaluation of the data.