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Modern parton distribution function fits require an accurate treatment ofheavy quark mass effects. In this contribution, we discuss how the FONLLgeneral-mass variable flavour number scheme can be extended to allow for thepossibility of a fitted charm PDF. We present a first estimate of the impact ofa fitted charm contribution in the FONLL structure functions, and we discussthe development towards including a fitted charm PDF in the NNPDF framework.

Towards parton distributions with fitted charm