Resolved Hubble space spectroscopy of ultracool binary systems E. L. Martín, W. Brandner, H. Bouy, G. Basri, J. Davis, R. Deshpande and M. M. Montgomery A&A, 456 1 (2006) 253-259 Published online: 23 August 2006 DOI: 10.1051/0004-6361:20054186