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The hierarchical cluster analysis is based on the following parameters :
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## [1] "West-Longitude: -1.33"
## [1] "South-Latitude: 49.29"
## [1] "East-Longitude: 0.18"
## [1] "North-Latitude: 49.7"
Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL.