Aside from above considerations, there is something more to say about as e.g. people computing pure Yang-Mills spectrum miss the true ground state of the theory due to a too much large lattice spacing (again a volume effect) that instead is properly hit by the lattice propagator as you can see in my post https://marcofrasca.wordpress.com/2008/06/27/meaning-of-lattice-results-for-the-gluon-propagator/. This is blatantly evident as no one is able to recover resonance from lattice computations. So, what really matters in the end is agreement of any computation with experiment. And I surely trust reality rather than whatever lattice computation still working at unrealistic volumes.

Finally, my propagator agrees fairly well with large volume lattice computations and numerical solution of Dyson-Schwinger equations and this support is enough for me to trust my conclusions (e.g. see my paper http://arxiv.org/abs/0803.0319 for such a comparison).

Marco

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