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We have recorded, in absorption, infrared spectra of samples of methane, CH 4 and CD 4 , dispersed at molar fraction 0.0001–0.005 in solid neon, in solid argon and in their equimolar solid mixture in the temperature range 3–21K and in the spectral domain 5000–500cm −1 at resolution 0.04–0.2cm −1 . We undertook quantitative fitting of the spectral profiles with components...