Examples of best-fit between PEPSO mutual impedance spectra (brown) and DSCD instrument model in the presence (resp. absence) of the magnetic field B_Earth in orange (resp. green). Multiple modeled spectra are presented for different f_pe/f_ce, from lighter to darker orange. Arrows indicate: the electron cyclotron frequency harmonics for f < f_uh in yellow, the upper-hybrid frequency f_uh in orange, the f_qn frequencies for f > f_uh in yellow.