  CP phase determination for the near future long baseline experiments, T2HK
and DUNE, will require precise measurements of the oscillation probabilities.
However, the uncertainty in the Earth's density must be considered in
determining these oscillation probabilities. Therefore, in this study, we
update the individual sensitivities of these experiments for determining the
current unknowns in the standard three flavor scenario considering the latest
configuration and also the complementarity between them while considering the
uncertainty in the density. Our study showed that this uncertainty has a
non-negligible impact on the precision of the CP phase determination
particularly for DUNE.
