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We discuss the interrelations between various basis set extrapolationformulas and show that for the nZaPa and aug-cc-pVnZ basis set formulas, forn=4--6 their behavior closely resembles the Petersson (L+a)^{-3} formula with ashift a specific to the basis set family and level of theory. This isfunctionally equivalent to the Pansini-Varandas extrapolation for large L. Thisnaturally leads to a simple way to extend these extrapolations to n=7 andhigher. The formula is validated by comparison with newly optimizedextrapolation factors for the AV{6,7}Z basis set pairs and literature valuesfor {6,7}ZaPa. For L\geq5, the CCSD extrapolations of both the Schwenke andVarandas type are functionally equivalent to E(L)=E_\infty+A.(L-0.30)^{-3},i.e., E(\infty)=E(L)+[E(L)-E(L-1)]/([(L-0.30)/(L-1.30)]^3-1)

A Simple 'Range Extender' for Basis Set Extrapolation Methods for MP2 and Coupled Cluster Correlation Energies