Table 1: The valuesa of T0,v and t2v.
Object IC 2501 IC 4191 NGC 2440
T0 (K) 7700 8600 12 600
t2 0.053 0.040 0.077
T0,v (K) 11 500 10 200 14800
t2v 0.002 0.001 0.011
a For the low-excitation PN, IC 2501, T0,v and t2vare deduced using the [N  II] $\lambda\lambda5754,~6678$ lines; for the high-excitation PNe, IC 4191 and NGC 2440, T0,v and t2vare deduced using the [O  III]  $\lambda\lambda4363,~5007$ lines.

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