A precise measurement of the magnetic field in the corona of the black hole binary V404 Cygni por Dallilar, Y, Eikenberry, SS, Garner, A, Stelter, RD, Gottlieb, A, Gandhi, P, Casella, P, Dhillon, VS, Marsh, TR, Littlefair, SP, Hardy, L, Fender, R, Mooley, K, Walton, DJ, Fuerst, F, Bachetti, M, Castro-Tirado, AJ, Charcos, M, Edwards, ML, Lasso-Cabrera, NM, Marin-Franch, A, Raines, SN, Ackley, K, Bennett, JG, Cenarro, AJ, Chinn, B, Donoso, HV, Frommeyer, R, Hanna, K, Herlevich, MD, Julian, J, Miller, P, Mullin, S, Murphey, CH, Packham, C, Varosi, F, Vega, C, Warner, C, Ramaprakash, AN, Burse, M, Punnadi, S, Chordia, P, Gerarts, A, De Paz Martín, H, Calero, MM, Scarpa, R, Acosta, SF, Sánchez, WM, Siegel, B, Pérez, FF, Martín, HD, Losada, JA, Nuñez, A, Tejero, Á, González, CE, Rodríguez, CC, Molgó, J, Rodriguez, JE, Cáceres, JIF, LA Rodríguez García, Lopez, MH, Dominguez, R, Gaggstatter, T, Lavers, AC, Geier, S, Pessev, P, Sarajedini, A