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Fabrizio, M, Braga, VF, Crestani, J, Bono, G, Ferraro, I, Fiorentino, G, Iannicola, G, Preston, GW, Sneden, C, Thevenin, F, Altavilla, G, Chaboyer, B, Dall'Ora, M, da Silva, R, Grebel, EK, Gilligan, CK, Lala, H, Lemasle, B, Magurno, D, Marengo, M et al, Marinoni, S, Marrese, PM, Martinez-Vazquez, CE, Matsunaga, N, Monelli, M, Mullen, JP, Neeley, J, Nonino, M, Prudil, Z, Salaris, M, Stetson, PB, Valenti, E and Zoccali, M (2021) On the Use of Field RR Lyrae As Galactic Probes: IV. New Insights Into and Around the Oosterhoff Dichotomy*. Astrophysical Journal, 919 (2). ISSN 0004-637X