All Tables

• Table 1: Positions and LSR velocities for the PPNe under study.
• Table 2: SEST FWHM beam widths and efficiencies at selected frequencies.
• Table 3: Observed lines.
• Table 4: Observed lines.
• Table 5: Adopted and derived modelling parameters of the two PPNe.
• Table 6: Calculated fractional abundances, with respect to n(H₂).
• Table 7: Calculated upper limits to fractional abundances, with respect to n(H₂).
• Table 8: Comparison with fractional abundances in other PPNe, arranged in order of decreasing stellar temperature.