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The scatter plots target versus input variables. The vertical axis is the full compressive strength of concrete expressed in megapascals. The horizontal axis is the amount of material in kilograms for cement and aggregate as well as in litres for water. (A) Cement; (B) water; (C) Fine aggregate (sand 0–2 mm); and (D) coarse aggregate (aggregate above 2 mm). The legend is in the left bottom corner.
