  A state of a single particle can be represented by a quantum blob in the
corresponding phase space, or by a cell in its 2-D subspace. Its area is
frequently stated to be no less than one half of the Plank constant, implying
that such a cell is an indivisible quantum of the 2-D phase space. But this is
generally not true, as is evident, for instance, from representation of some
states in the basis of innately discrete observables like angular momentum.
Here we consider some dispersed states involving the evanescent waves (EW)
different from that in the total internal reflection. Such states are
represented by a set of separated point-like cells, but with a large total
indeterminacy. An idealized model has a discrete Wigner function forming an
infinite periodic array of dots on the phase plane. The question about the
total momentum indeterminacy in such state is discussed. We argue that the
transverse momentum eigenstates corresponding to the considered EW-s cannot be
singled out by any known measurement procedure, and the whole infinite set of
the corresponding eigenvalues can contribute only a certain fraction to the
observed momentum indeterminacy which remains finite.
