The double blue-straggler sequence in NGC 2173: an artifact of field contamination E. Dalessandro, F. R. Ferraro, N. Bastian, M. Cadelano, B. Lanzoni and S. Raso A&A, 621 (2019) A45 Published online: 04 January 2019 DOI: 10.1051/0004-6361/201834011