For the classification, only the diagnostic criteria are relevant. Numerical values obtained in the field or in the laboratory have to be taken as such and must not be rounded when compared with the threshold values in the diagnostic criteria. A layer may fulfil the criteria of more than one diagnostic horizon, property or material, which are then regarded as overlapping or coinciding. If a diagnostic horizon consists of several subhorizons, the diagnostic criteria (except thickness) must be fulfilled in every subhorizon separately (averages are not calculated), unless specified otherwise.