All Tables

• Table 1: Class 0 objects observed for the survey.
• Table 2: Observed emission lines.
• Table 3: Line parameters of the N₂H⁺ and N₂D⁺ lines.
• Table 4: Observational parameters of the C¹⁸O and HCO⁺ lines.
• Table 5: N₂H⁺ and N₂D⁺ column densities.
• Table 6: Continuum observations and derived properties (dust temperature, C¹⁸O column density, CO depletion factor) for sources in our survey.
• Table 7: Bolometric luminosity and distance-normalised flux of Class 0 protostars in our sample.
• Table 8: Velocities of C¹⁸O and HCO⁺ lines and asymmetry parameters.
• Table 9: Deuterium fractionation of several molecular species.
• Table 10: Model results.