Continued: Spectra observed towards L1551-IRS5 (see Table A.4 in T_MB scale). Lower left panel of the first column: In the CCD(3–2) spectrum the velocity scale is centered on the brightest (2 D²) hyperfine component (vertical blue line) at 216428.3 MHz; the vertical red lines indicate the offset in velocity of the fainter components (0.3 D² at 216430.3 MHz; 0.7 D² at 216428.8 MHz). Upper middle panel: In the CCD(3–2) spectrum the velocity scale is centered on the brightest (3 D²) hyperfine component (vertical blue line) at 216372.8 MHz; the vertical red lines indicate the offset in velocity of the fainter components (1.9 D² at 216373.3 MHz; 1.4 D² at 216373.2 MHz). In the DCN(3–2) spectrum the velocity scale is centered on the brightest (35 D²) hyperfine component (vertical blue line) at 217238.3 MHz; the vertical red lines indicate the offset in velocity of the fainter components (20 D² at 217238.6 MHz; 16 D² at 217238.3 MHz). In the N₂D⁺ spectrum the velocity scale is centered on the brightest (312 D²) hyperfine component (vertical blue line) at 231319.9 MHz; the vertical red line indicates the offset in velocity of the brightest transition of 40 fainter components (5 D² at 231324.5 MHz).