Notes. Values in parentheses are the uncertainty of the last significant figures. ^a Adopted rest frequencies. ^b Local standard of rest velocity of the emission for the adopted rest frequency (in km s⁻¹). ^c Line width at half-intensity derived by fitting a Gaussian profile to the observed lines (in km s⁻¹). ^d Integrated line intensity in mK km s⁻¹. We assumed that the uncertainty is dominated by the calibration error of 10%. ^e The sensitivity of the data (root mean square error) has been derived from a baseline fit to each line in a velocity window from −10 to 20 km s⁻¹ (in mK). ^f Excitation temperature derived from the LVG modelling for each hyperfine transition. ^gF_u − F_l = 3 − 2 component. ^h Weighted average of the F_u − F_l = 4 − 3 and F_u − F_l = 5 − 4 hyperfine components. ⁱSum of the line strengths of the hyperfine components that contribute to the line. ^jWeighted average of the three strongest hyperfine components. ^k Partially blended with an unidentified line. ^lFully blended with C¹³CS. ^m Partially blended with HCCC¹³CCCCN. The fit to the blended line was made as the sum of two independent lines with free parameters. One of the lines appears with the radial velocity of TMC-1, and we therefore assumed the parameters given for the fit of this line.