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Due to late time non-linearities, the location of the acoustic peak in thetwo-point galaxy correlation function is a redshift-dependent quantity, thus itcannot be simply employed as a cosmological standard ruler. This has motivatedthe recent proposal of a novel ruler, also located in the Baryon AcousticOscillation range of scales of the correlation function, dubbed the "linearpoint". Unlike the peak, it is insensitive at the $0.5\%$ level to many of thenon-linear effects that distort the clustering correlation function and shiftthe peak. However, this is not enough to make the linear point a usefulstandard ruler. In addition, we require a model-independent method to estimateits value from real data, avoiding the need to deploy a poorly known non-linearmodel of the correlation function. In this manuscript, we precisely validate aprocedure for model-independent estimation of the linear point. We alsoidentify the optimal set-up to estimate the linear point from the correlationfunction using galaxy catalogs. The methodology developed here is of generalvalidity, and can be applied to any galaxy correlation-function data. As aworking example, we apply this procedure to the LOWZ and CMASS galaxy samplesof the Twelfth Data Release (DR12) of the Baryon Oscillation SpectroscopicSurvey (BOSS), for which the estimates of cosmic distances using the linearpoint have been presented in Anselmi et al. (2017) [1].

The Linear Point Standard Ruler for galaxy survey data: validation with mock catalogues