Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicityS.K. Leggett, B. Burningham, D. Saumon, M.S. Marley, S.J. Warren, H.R.A. Jones, D.J. Pinfield and R.L. SmartEPJ Web of Conferences, 16 (2011) 06007DOI: https://doi.org/10.1051/epjconf/20111606007