Continued: Observed spectra of the molecules, towards L1551-IRS5, listed in Table A.4 (in T_MB scale). In theCH₃CCH spectrum the velocity scale is centered on the CH₃CCH emission at 222128.8 MHz; the vertical red line indicates possible contamination due to HCOOCH₃ at 222128.2 MHz. In the three HCOOCH₃ spectra the spectra are centered on the brightest component (vertical blue line) and the vertical red lines indicate the offset in velocity and strength of the fainter components reported in Table A.4.