Have you ever wished that Microsoft Excel had in-built ...

3) Nos. of rows of time and concentration values are less than 2; i.e., only one value specified in the range. 4) The time or concentration ranges specified are more than one column. 5) Invalid data in the data range, e.g. a) Negative values of concentration or time data. b) Non-numerical character in the concentration or time data ................
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