Characterization of S/N for most intense ions (m/z 1422 (fundamental), m/z 711 (2f), m/z 474 (3f), and m/z 237 (6f)) observed in the parallel mass spectra from the dipole and sixth harmonic detectors. Red square is a fundamental signal from the dipole detector. Black square, green triangle, purple circle, and blue star are fundamental, second, third, and sixth harmonic signals from the sixth harmonic detector, respectively.