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There are, for 72 stations, two types of measurements:
# The abundance-dominance coefficient of 50 plant species (coefficient ranging from 0 = the plant is absent, to 9 = the species covers more than three-quarters of the surface). The whole set of the 50 coefficients defines the floristic profile of a station.
# Eleven pedological measurements ([[Pedology (soil study)|Pedology]] = soil science): particle size, physical, chemistry, etc. The set of these eleven measures defines the pedological profile of a station.
Three analyses are possible:
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