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xFitter is an open-source package that provides a framework for thedetermination of the parton distribution functions (PDFs) of the proton formany different kinds of analyses in Quantum Chromodynamics (QCD). Itincorporates experimental data from a wide range of experiments includingfixed-target, Tevatron, HERA, and LHC. xFitter version 2.0.0 has recently beenreleased, and offers an expanded set of tools and options. The new xFitter2.0.0 program links to the APFEL code which has implemented generalizedmatching conditions that enable the switch from $N_F$ to $N_F+1$ active flavorsat an arbitrary matching scale $\mu_m$. This enables us to generalize thetransition between a FFNS and a VFNS and essentially vary continuously betweenthe two schemes; in this sense the matching scale $\mu_m$ allows us to unifythe FFNS and VFNS in a common framework. This paper provides a brief overviewof xFitter with emphasis of these new features.

xFitter 2.0.0: Heavy quark matching scales: Unifying the FFNS and VFNS