Distribution of ionized, atomic, and PDR gas around S 1 in ρ Ophiuchus B. Mookerjea, G. Sandell, V. S. Veena, R. Güsten, D. Riquelme, H. Wiesemeyer, F. Wyrowski and M. Mertens A&A, 648 (2021) A40 Published online: 09 April 2021 DOI: 10.1051/0004-6361/202040217