Rapidly increasing collimation and magnetic field changes of a protostellar H2O maser outflow G. Surcis, W. H. T. Vlemmings, H. J. van Langevelde, C. Goddi, J. M. Torrelles, J. Cantó, S. Curiel, S.-W. Kim and J.-S. Kim A&A, 565 (2014) L8 Published online: 22 May 2014 DOI: 10.1051/0004-6361/201423877