Low-temperature optical constants of amorphous silicate dust analogues K. Demyk, V. Gromov, C. Meny, N. Ysard, D. Paradis, A. P. Jones, D. Petitprez, P. Hubert, H. Leroux, C. Nayral and F. Delpech A&A, 666 (2022) A192 Published online: 28 October 2022 DOI: 10.1051/0004-6361/202243815