  A class of nucleon-nucleon interactions which are exactly phase equivalent to
a given realistic nucleon-nucleon interaction are exhibited. These interaction
have the property that the RMS radius of the deuteron can be made arbitrarily
large without changing any of the scattering or bound-state observables. With
this construction it is possible to find realistic interactions that do not
obey the linear relation between the RMS radius and the triplet scattering
length observed by Klarsfeld et. al. The interpretation of these examples is
discussed.
