[O III] line properties in two samples of radio-emitting narrow-line Seyfert 1 galaxies M. Berton, L. Foschini, S. Ciroi, V. Cracco, G. La Mura, F. Di Mille and P. Rafanelli A&A, 591 (2016) A88 Published online: 20 June 2016 DOI: 10.1051/0004-6361/201527056