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We have investigated the quark sector of quenched QCD for 1.5\le T/Tc\le3 inthe continuum limit, using two different lattice discretisations of quarks andextrapolating from lattice spacings between 1/4T and 1/14T. At thesetemperatures, the flavour off-diagonal susceptibility, chi_{ud}/T^2, iscompatible with zero at each lattice spacing, and hence also in the continuumlimit. In the continuum limit, the light quark susceptibilities are about 10%less than the ideal gas results even at the highest T, in agreement with hardthermal loop predictions but marginally below a resummed perturbativecomputation. For the mass range appropriate to the strange quark, the flavourdiagonal susceptibility is significantly smaller. Our estimate of theWroblewski parameter is compatible with observations at RHIC and SPS. Thecontinuum limit of screening masses in all (local) quark-bilinears is veryclose to the ideal gas results

Valence quarks in the QCD plasma: Quark number susceptibilities and screening