  We present the scattering lengths for the $\pi\pi$ processes in the three
flavour Chiral Perturbation Theory (ChPT) framework at next-to-next-to-leading
order. We then combine this calculation with the determination of the
parameters from $K_{e4}$ and the masses and decay constants and compare with
the results of a dispersive analysis of $\pi\pi$ scattering. The comparison
indicates a small but nonzero value for the $1/N_c$ suppressed NLO low energy
constants $L_4^r$ and $L_6^r$.
