Recently, we recorded the THz centrifugal distortion-induced spectrum of methane using synchrotron radiation at the SOLEIL facility. Intensities of pure rotation lines of CH4 were precisely measured, from which the induced dipole moment of this weak spectrum, of great interest for planetology, was accurately inferred. This study should in particular help to measure methane concentrations in Titan’s atmosphere. Here, we continue the work by presenting spectra of CH4/N2 mixtures, again recorded with a 150 m optical path in a White cell and a Bruker IFS 125 HR FTIR spectrometer at the AILES beamline of SOLEIL. More precisely, the spectra were recorded with 5 % of CH4 in N2 at various total pressures (ca. 100, 200, 400, 600 and 800 mbar). These spectra will allow to measure collisional broadening and shift coefficients, as well as line-mixing parameters, with N2 as a perturber (like in Titan’s atmosphere).