Graphical representation of molecular abundances relative to the CH₃OH abundance as given in Table 6 for IRS7B, the hot corino source IRAS 16293-2422, the WCCC source L1527, the quiescent protostar B1-b, and the L1157 outflow. See the notes of Table 6 for references. For a discussion on the classification of gas and grain formation of the organic species, see Charnley (1997, 2001). (A colour version of this plot is available in the online Journal.)