Results of RFI mitigation test observations of two objects. Shown are standard Nançay ACRT auto-correlator H I line spectra (in blue) and spectra obtained with the WIBAR broadband receiver, both without RFI mitigation (in grey) and after RFI mitigation using the ROBEL software package (in black). Shown is flux density (in millijansky) as a function of heliocentric radial velocity in the optical framework, cz (in km s⁻¹). The velocity resolution is 11.1 km s⁻¹ for the WIBAR spectra, and 10.3 km s⁻¹ for the standard ACRT spectra. The pairs of vertical dotted red lines indicate the profile widths of the EBHIS spectra.