  We present two arguments indicating that the large value for the $\epsilon_1$
mixing parameter at 50 MeV, which the Basel group extracted from their recent
$A_{zz}$ measurement, may be incorrect. First, there are nucleon-nucleon (NN)
potentials which predict the $\epsilon_1$ at 50 MeV substantially below the
Basel value and reproduce the Basel $A_{zz}$ data accurately. Second, the large
value for $\epsilon_1$ at 50 MeV proposed by the Basel group can only be
explained by a model for the NN interaction which is very unrealistic (no
$\rho$-meson and essentially a point-like $\pi NN$ vertex) and overpredicts the
$\epsilon_1$ in the energy range where it is well determined (150--500 MeV) by
a factor of two.
