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Sets new headers for all the columns.

        headers - A list or tuple containing the new values.
                The first value in this variable if set as the header for the first column and so on.
        Raises an IndexError if headers does not have the correct number of elements.
        It must have the same number of elements as rows

src/p/e/PEATDB-2.3/PEATDB/plugins/PCA.py   PEATDB(Download)
	headers = r.columnHeaders()[:1] + tuple(headers)
	P.writeToFile(basis, 'NewBasis.csv')