  A new analysis of the modification of the hadronization process in the
nuclear medium for pions is presented. The effective description is condensed
in a set of medium modified fragmentation functions (nFFs) obtained at
next-to-leading order (NLO) accuracy. The study was made using the open-source
tool xFitter, conveniently modified to incorporate semi-inclusive processes.
Theoretical uncertainties for the nFFs are also provided.
