  We present results for the lowest-order non-vanishing quark number
susceptibilities. These were calculated using an improved action viz. the HISQ
action, which controls taste violations that are responsible for distorting the
light meson spectrum. Our calculations, with a pion mass of 160 MeV, are also
much closer to the physical limit than previous studies. We find a broad
crossover from the hadronic to the quark regimes, although interactions remain
significant even at the highest temperatures studied. Our results are also in
good agreement with Hadron Resonance Gas models below the crossover
temperature.
