Evolution of IMBH-MS binaries with an initial orbital period of P_orb,i = 1.0 day and varying initial donor-star masses. Top panel: Orbital period vs. stellar age. Bottom panel: Orbital period vs. donor-star mass for γ = 1.60. Open circles, solid triangles, and solid stars indicate the onset of RLOF and the points at which IMBH binaries become visible by LISA at distances of 1 kpc and 10 kpc, respectively. Sources marked by open triangles become undetectable by LISA at 1 kpc.