  We investigate the modification of S and P wave states in the bottomonium
spectrum above and below the deconfinement crossover temperature through their
spectral functions obtained from the maximum entropy method. Anisotropic
ensembles with $N_f=2+1$ Wilson clover fermions with tadpole-improvement are
used while the bottom quark is treated with an improved non-relativistic
action. We observe significant modifications of the P wave $\chi_{b1}$ ground
state directly above the crossover temperature, $T_c$, while the S wave
$\Upsilon$ ground state remains relatively unchanged up to temperatures of
almost $2T_c$. This evidence supports earlier conclusions from our FASTSUM
collaboration of the immediate dissociation of the P wave states above $T_c$
and the survival of the S wave ground states up to $2T_c$.
