Schematic diagram of detected molecules in the same λ ~ 1.3 cm spectral range toward IRC +10216 and TMC-1. Molecules in the red, blue, and purple regions indicate that they are detected in IRC +10216, TMC-1, and both sources, respectively. The molecules in black indicate that they have been seen in both sources but are not detected toward the other source in the λ ~ 1.3 cm spectral range (see Sect. 4.5).