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We introduce two new eccentricity measures to analyze numerical simulations.Unlike earlier definitions these eccentricity measures do not involve any freeparameters which makes them easy to use. We show how relatively inexpensivegrid setups can be used to estimate the eccentricity during the early inspiralphase. Furthermore, we compare standard puncture data and post-Newtonian datain ADMTT gauge. We find that both use different coordinates. Thus loweccentricity initial momentum parameters for a certain separation measured inADMTT coordinates are hard to use in puncture data, because it is not known howthe separation in puncture coordinates is related to the separation in ADMTTcoordinates. As a remedy we provide a simple approach which allows us toiterate the momentum parameters until our numerical simulations result inacceptably low eccentricities.

A Simple method to set up low eccentricity initial data for moving puncture simulations