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Excel would be enhanced by an interpolation function that allows a column of values representing a function of independent variables listed in one column to be interpolated as a function of differently spaced independent variables listed in a third column. An important example is comparison of theory and experiment. From the experiment, values are measured at fixed time increments. From the theory, values are calculated at different time increments. To compare theory and experiment one would like to have both experimental and theoretical values expressed as functions having the same time increments.