(color online) High-order harmonic spectra of initially in the ground state (G case) (blue dash line) and in the first excited state (U case) (red solid line) are irradiated by a 1400-nm, 10-cycle, -W/cm² laser pulse. The positions of the spectral minima are marked with black arrows. The harmonic intensitiy of G case is multiplied by factors of 10³ for the purpose of clarity.