  We present continuum extrapolated lattice QCD results for up to fourth-order
diagonal and off-diagonal quark number susceptibilities in the high temperature
region of 300-700 MeV. Lattice QCD calculations are performed using 2+1 flavors
of highly improved staggered quarks with nearly physical quark masses and at
four different lattice spacings. Comparisons of our results with recent weak
coupling perturbative calculations yield reasonably good agreements for the
entire temperature range.
