Characteristic strain of the successful CE ejection. The characteristic strain of the GWs released by the entire simulation (the core of the RG, its envelope, and the companion) is shown in blue. In green we show the characteristic strain of the GW signal produced by only the core of the RG and the companion. The dashed gray line represents twice the orbital frequency at the beginning of the simulation. The black lines show the characteristic strain produced by toy models (see Sect. 3.4). The LISA sensitivity from Robson et al. (2019) is shown by the dashed orange line.