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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Desirability ramp and bar chart for optimization. (A). Desirability ramp shows the levels for independent variables and predicted values for the responses of the optimum formula; (B). Bar Chart shows the desirability values for the combined responses.