  We fit lattice-QCD data for light-pseudoscalar masses and decay constants,
from HISQ configurations generated by MILC, to SU(3) staggered chiral
perturbation theory. At present such fits have rather high values of
chi^2/d.o.f., possibly due to the lack of ensembles with lighter-than-physical
sea strange-quark masses. We propose solutions to this problem for future work.
We also perform simple linear interpolations near the physical point on two
ensembles with different lattice spacings, and obtain the preliminary result
(f_K / f_pi)^phys = 1.1872(41) in the continuum limit.
