Significance of the modulation power, L(L + 1)m_L/ 2π, at bipolar multipoles L. The modulation spectra obtained from the four component separation maps (C-R, NILC, SEVEM, and SMICA) are consistent with each other. Dipole (L = 1) modulation power is detected in all the spectra at a significance ranging from 2.9 to 3.7σ. The solid black lines denote the 3σ significance thresholds. There is no significant power detected at higher multipole of the modulation field, 1 <L ≤ 32.