1) Since we rely on the Torres relation to derive stellar parameters,
   you cannot trust the stellar parameters if your stars do not fall
   within the range of stars used by Torres to determine his
   relationship [(post) main sequence stars M_star < 0.6 M_sun].

2) We use quadratic limb darkening, which is known to be flawed at the
   precision of Kepler data for large (rp/rstar > 0.04) planets.