  Non-relativistic potential models are considered of the pure power
V(r)=sgn(q) r^q and logarithmic V(r)=ln(r) types. It is shown that, from the
spectral viewpoint, these potentials are actually in a single family. The log
spectra can be obtained from the power spectra by the limit q --> 0 taken in a
smooth representation P(n,l,q) for the eigenvalues E(n,l,q). A simple
approximation formula is developed which yields the first thirty eigenvalues
with error < 0.04%.
