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The geographic distribution of the values of a climate variable is shown on a map.
The map is color-coded according to the species and the climate variable selected.
The values of the climate variable X are retrieved for the habitats of all the accessions
of the selected species, and the mean value µ and the standard deviation σ
of those values are computed. Then the areas are color-coded according to the following
ranges of the values of X:
X < µ - 2 * σ,
µ - 2 * σ < X < µ - σ,
µ - σ < X < µ, µ < X < µ + σ , µ + σ < X < µ + 2 * σ,
µ + 2 * σ < X

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