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Crestani, J, Braga, VF, Fabrizio, M, Bono, G, Sneden, C, Preston, GW, Ferraro, I, Iannicola, G, Nonino, M, Fiorentino, G, Thévenin, F, Lemasle, B, Prudil, Z, Alves-Brito, A, Altavilla, G, Chaboyer, B, Dall'Ora, M, D'Orazi, V, Gilligan, CK, Grebel, E et al, Koch-Hansen, AJ, Lala, H, Marengo, M, Marinoni, S, Marrese, PM, Martínez-Vázquez, CE, Matsunaga, N, Monelli, M, Mullen, JP, Neeley, J, Silva, RD, Stetson, PB, Salaris, M, Storm, J, Valenti, E and Zoccali, M On the Use of Field RR Lyrae as Galactic Probes. III. The $α$-element abundances. Astronomy and Astrophysics. ISSN 0004-6361 (Accepted)