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\begin{quote}  We just used and combined catalog data from many different large area  surveys containing photmetric photometric  description of different extragalactic sources (galaxies and quasars): their magnitude, fluxes, and morphological parameters. Then  we subjected these large tables to some Machine Learning methods to estimate the redshift of the sources. The result was an augmented table which included additional information about estimates of photometric redshits.   \end{quote} 
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minimum amount of data necessary to supplement a published article, or  to accommodate the requests of the referees to see the data. In some  other cases, astronomers post various levels of data, from raw to  reduced data. Yet, whether the amount and description of data suplied supplied  is sufficient to entirely replicate a study is unclear and varies from case to  case. One astronomer admits that access to raw data is a barrier to  reproducibility of results: