Visualization of molecular fractional abundances (in black and referred to the left axis) and line widths (in red and referred to the right axis) in L483 for different chemical families. Abundances are obtained from the beam-averaged column densities listed in Table 1, adopting a column density of H₂ of 4 × 10²² cm⁻² (see Sect. 4.2). CO is not plotted. For molecules with optically thick lines we used the column densities of optically thin isotopologs and scaled up adopting local ISM isotopic ratios as follows: for HCO⁺ the ¹⁷O isotopolog was used adopting ¹⁶O/¹⁷O = 2317 (Wouterloot et al. 2008); for CN, HCN, and HNC we used the ¹⁵N isotopolog assuming ¹⁴N/¹⁵N = 290 (Adande et al. 2012); and for CH₃OH and CS we used the ¹³C isotopolog and assumed ¹²C/¹³C = 68 (Milam et al. 2005). In the cases of C₂H and N₂H⁺, scaling from ¹³C and ¹⁵N isotopologs, respectively, is probably not valid due to important fractionation effects (see Sects. 4.5.2 and 4.5.3), and therefore only lower limits are given. H₂CO and NH₃ are not shown because we only detect deuterated forms and the deuterium fractionation is uncertain for these species. Line widthsrepresented as red circles are averages over the FWHM of all those lines fitted to a Gaussian function (Δv in Table A.1). For those molecules showing complex profiles (e.g., wings) the values plotted as red diamonds correspond to the highest velocity |V_LSR − v_sys| at which emission is detected.