  In large enough volumes, translation-averaging for quark-line connected
diagrams reduces the variance inversely proportional to the volume. Stochastic
estimators which implement translation averaging however introduce new sources
of fluctuations, which in some cases can be relatively large. In this work, we
explore whether inexact deflation subspaces can be used to improve the
precision of the isovector vector correlators. We perform numerical experiments
with $N_\mathrm{f}=2$ non-perturbatively $\mathrm O(a)$-improved Wilson
fermions and measure the relative contribution from the deflation subspace to
the central value and the corresponding variance.
