The ionized gas in nearby galaxies as traced by the [NII] 122 and 205 μm transitions by Herrera-Camus, R, Bolatto, A, Smith, J, Draine, B, Pellegrini, E, Wolfire, M, Croxall, K, Looze, I, Calzetti, D, Kennicutt, R, Crocker, A, Armus, L, van der Werf, P, Sandstrom, K, Galametz, M, Brandl, B, Groves, B, Rigopoulou, D, Walter, F, Leroy, A, Boquien, M, Tabatabaei, F, Beirao, P