The equilibrium E- to A- methanol ratio as a function of nuclear spin temperature (solid curve). Ratios  <1 observed towards our sources are plotted as stars according to this relation, errorbars indicating effect of a 10% difference in the assumed T_ex for A-methanol. Horizontal arrows represent sources where ratios  >1 according to the y-scale, and are drawn from the equivalent spin temperature of the lower errorbar.