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AT HERA heavy quarks may contribute up to 30% of the structure function$F_2$. The introduction of heavy quarks requires an extension of the DGLAPformalism. The effect of using different heavy flavour number schemes, anddifferent approaches to the running of $\alpha_s$, are compared using the ZEUSPDF fit formalism. The potential of including charm data in the fit isexplored, using $D^*$ double differential cross-sections rather than theinclusive quantity $F_2^{c\bar{c}}$.

Including heavy flavour production in PDF fits