Kippenhahn diagrams of the stellar tracks computed with the three mass-loss rates with M_ZAMS = 200 M_⊙. The solid blue and green regions show the H and He burning zones, and the purple hatched region shows convective zones. The solid black and navy lines indicate the total mass and the mass of the He core. The red square indicates when the star enters the WR phase (i.e., when $X_{\mathrm{H}}^{\mathrm{S}}$ < 0.3).