Characteristic strain of the GW signal released by the successful common-envelope ejection (in blue) assuming a distance of 1 kpc to the source. The LISA sensitivity from Robson et al. (2019) is shown by the dashed orange line. The vertical dashed gray line represents twice the orbital frequency at the beginning of the CE (assuming a perfectly circular and Keplerian motion). The dashed black line represents twice the orbital frequency after the ejection of the envelope. The dotted black lines represent the first four harmonics of the final orbital frequency (f_n = n ⋅ f_orb, final).