A spectral analysis of the fluctuations of the infrared sky radiance at λ ≈ 10μmwas made at the ESO-site of La Silla in Northern Chile. The data are compared to literature. The consequences of the results on infrared observing for future large telescopes are discussed: our data suggest that in order to achieve background noise limited performance in the 10μmatmospheric window chopping with frequencies of ≈8 Hz and amplitudes of ≈10 arcsec is m
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