Methanol: a diagnostic tool for high-mass star-forming regions
  We here present an innovative technique to handle the problem of deriving physical parameters from observed multi-line spectra of methanol, based on the simultaneous fit of all the lines with a synthetic spectrum computed under the Large Velocity Gradient approximation; the best physical parameters are found using numerical methods. 
S. Leurini (1), P. Schilke (1), K.M. Menten (1), D.R. Flower (2), J.T.   Pottage (2) and L.-H Xu (3) ((1) Max-Planck-Institu...