def build_nasa(nasa_coeffs, row):
            """
            Creates string of nasa polynomial coefficients
            :param nasa_coeffs
                cantera species thermo coefficients object
            :param row
                which row to write coefficients in
            """
            line_coeffs = ''
            lines = [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13, 14]]
            line_index = lines[row-2]
            for ix, c in enumerate(nasa_coeffs):
                if ix in line_index:
                    if c >= 0:
                        line_coeffs += ' '
                    line_coeffs += str('{:.8e}'.format(c))
            return line_coeffs