  We present some lattice QCD results on first ($\chi_1^i$) and second
($\chi_2^i$) cumulants of and correlations ($\chi_{11}^{ij}$) among net
baryon-number ($B$), strangeness ($S$) and electric charge ($Q$) along the
pseudo-critical line ($T_{pc}(\mu_B)$) in the temperature ($T$)--baryon
chemical potential ($\mu_B$) phase diagram of (2+1)-flavor QCD. We point out
that violations of the isospin symmetric limit of vanishing electric charge
chemical potential are small along the $T_{pc}(\mu_B)$ for the entire range of
$\mu_B$ covered in the RHIC beam energy scan. For the strangeness neutral
matter produced in heavy-ion collisions this leads to a close relation between
$\chi_{11}^{BS}$ and $\chi_{11}^{QS}$. We compare lattice QCD results for
$\chi_{11}^{BS}/\chi_2^S$ along the $T_{pc}(\mu_B)$ line with preliminary
experimental measurements of $\chi_{11}^{BS}/\chi_2^S$ for collision energies
$7.7~{\rm GeV}\le \sqrt{s_{_{NN}}}\le 62.4~{\rm GeV}$. While we find good
agreements for $\sqrt{s_{_{NN}}}\ge 39$~GeV, differences are sizeable at
smaller values of $\sqrt{s_{_{NN}}}$. Moreover, we compare lattice QCD results
for the ratio of the strangeness ($\mu_S$) to baryon ($\mu_B$) chemical
potentials, which define a strangeness neutral system with fixed electric
charge to baryon number density, with experimental results obtained by the STAR
collaboration for $\mu_S/\mu_B$ using strange baryon yields on the freeze-out
line. Finally, we determine the baryon chemical potential at the freeze-out
($\mu_B^f$) by comparing $\chi_1^B/\chi_2^B$ along the $T_{pc}(\mu_B)$ with the
experimentally measured net-proton cumulants $\chi_1^p/\chi_2^p$. We find that
$\{\mu_B^f, T_{pc}(\mu_B^f) \}$ are consistent with the freeze-out parameters
of the statistical-model fits to experimentally measured hadron yields for
$\sqrt{s_{_{NN}}} \geq 11.5$ GeV.
