Methanol maps of low-mass protostellar systems - I. The Serpens molecular core L. E. Kristensen, E. F. van Dishoeck, T. A. van Kempen, H. M. Cuppen, C. Brinch, J. K. Jørgensen and M. R. Hogerheijde A&A, 516 (2010) A57 Published online: 28 June 2010 DOI: 10.1051/0004-6361/201014182