[en] The structure factor of deuterium gas has been measured, close to the critical region, by S.N. Ishmahev et al. and by M. Zoppi et al. by means of neutron scattering. The results, qualitatively similar, show discrepancies which are above the estimated experimental accuracies, however. The different scattering angles used in the two experiments (22-135deg for the former and 5-20deg for the latter), and the consequently different inelastic scattering corrections, are probably responsible for the inconsistency. Simple considerations show that using small scattering angles gives a better reliability of the results. (orig.)