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Charles Joseph Minard's famous graph showing the fate of the French Army of 1812 during their invasion of Russia.

Charles Joseph Minard’s famous graph showing the decreasing size of the Grande Armée as it marches to Moscow (brown line, from left to right) and back (black line, from right to left) with the size of the army equal to the width of the line. Temperature is plotted on the lower graph for the return journey (multiply Réaumur temperatures by 1¼ to get Celsius, e.g. −30 °R = −37.5 °C).