  New results on charm quark production at HERA in an increased phase space in
deep-inelastic scattering and photoproduction are discussed. Single &
double-differential cross section distributions are compared to next-to-leading
order QCD calculations as well as to MC@NLO in the photoproduction regime. The
charm contribution to the proton structure, F_2^cc(x,Q^2), is determined with
different experimental techniques and finally combined.

High Energy Physics - Experiment