  We use low energy pion-pion phase-shifts in order to make distinction between
the alternatives for the value of the quark-antiquark condensate $B_0$ in the
chiral limit. We will consider the amplitude up to and including ${\cal
O}(p^4)$ contributions within the Standard and Generalized Chiral Perturbation
Theory frameworks. They are unitarized by means of Pad\'e approximants in order
to fit experimental phase-shifts in the resonance region. As the best fits
correspond to $\alpha = \beta = 1$, we conclude that pion-pion phase-shift
analysis favors the standard ChPT scenario, which assumes just one, large
leading order parameter $<\bar q q >_{_0}$.
