  We theoretically study skyrmion lattices realized in a Kondo lattice model on
a triangular lattice, focusing on the phase, ellipticity, and angle of the
constituent multiple-$Q$ waves. Analyzing the numerical data obtained in the
previous study [Ozawa R, Hayami S and Motome Y 2017 Phys. Rev. Lett. 118
147205], we extract these parameters for the two types of skyrmion lattices
with the skyrmion number of $1$ and $2$. We show that the topological
transition between the two skyrmion lattices driven by an external magnetic
field is accompanied by significant modulations of all three parameters.
