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The hierarchical cluster analysis is based on the following parameters :
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## [1] "West-Longitude: 3.31"
## [1] "South-Latitude: 40.08"
## [1] "East-Longitude: 10.22"
## [1] "North-Latitude: 43.56"
Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL.