  Pseudo-$\epsilon$ expansions ($\tau$-series) for critical exponents of 3D XY
model describing $\lambda$-transition in liquid helium are derived up to
$\tau^6$ terms. Numerical estimates extracted from the $\tau$-series obtained
using Pad\'e-Borel resummation technique, scaling relations and seven-loop
($\tau^7$) estimate for the Fisher exponent $\eta$ are presented including
those for exponents $\alpha$ and $\nu$ measured in experiments with record
accuracy. For the exponent $\alpha$ the procedure argued to be most reliable
gives $\alpha= -0.0117$. This number is very close to the most accurate
experimental values differing appreciably from the results of numerous lattice
and field-theoretical calculations. It signals that the pseudo-$\epsilon$
expansion is a powerful tool robust enough to evaluate critical exponents with
very small absolute error. The arguments in favour of such a robustness are
presented.
