B. Kelly. (2007)cite arxiv:0705.2774
Comment: 39 pages, 11 figures, 1 table, accepted by ApJ. IDL routines
(linmix_err.pro) for performing the Markov Chain Monte Carlo are available at
the IDL astronomy user's library, http://idlastro.gsfc.nasa.gov/homepage.html.
?. Research Report, 95-73. Laboratoire Informatique Signaux et Systemes de Sophia Antipolis / Laboratoire d'Electronique, Antennes et Telecommunications, CNRS / Universite de Nice-Sophia Antipolis, 250 rue Albert Einstein, Sophia Antipolis, 06560 Valbonne, France, (1996)