Fully Characterizing Axially Symmetric Szekeres Models With Three Data
  Sets
  Inhomogeneous exact solutions of General Relativity with zero cosmological
constant have been used in the literature to challenge the \Lambda CDM model.
From one patch Lema\^itre-Tolman-Bondi (LTB) models to axially symmetric
quasi-spherical Szekeres (QSS) Swiss-cheese models, some of them are able to
reproduce to a good accuracy the cosmological data. It has been shown in the
literature that a zero-\Lambda -LTB model with a central observer can be fully
determined by two data sets. We demonstrate that an axially symmetric
zero-\Lambda -QSS model with an observer located at the origin can be fully
reconstructed from three data sets, number counts, luminosity distance and
redshift drift. This is a first step towards a future demonstration involving
five data sets and the most general Szekeres model.
