Maps continuous values to HEX color values. The positive values are mapped to the "Reds" palette from Color Brewer 2 http://colorbrewer2.org/#type=sequential&scheme=Reds&n=3, and the negative values are oppsitely mapped to the "Blues" palette from the Color Brewer 2 http://colorbrewer2.org/#type=sequential&scheme=Blues&n=3.
a numeric vector storing values to map
a character vector storing the mapped HEX color values
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