Three-dimensional distributions of Miras in the MW. The position of O-rich stars in our sample is shown in circles color-coded by period. C-rich stars are included as red ticks. We over-plot the Miras from OGLE project presented in Iwanek et al. (2022) with the distances reported in Iwanek et al. (2023) as gray dots. The Sun is located at (X, Y)=(0,0), and marked with a yellow dot, and the Galactic center is marked with a red cross at (X, Y)=(8.34,0). Log-periodic spiral arm segment fit of the local arm based on VLBI trigonometric parallaxes of high-mass star-forming regions by Reid et al. (2019) is represented with a turquoise-colored section. The thick lines represent qualitative logarithmic spiral arm fits from Minniti et al. (2021), with the thin dashed lines marking the 1σ arm widths reported in Reid et al. (2019) (Sct-Cen arm, blue; Sgr-Car arm, orange; Perseus arm, black; Outer arm, purple). The line of nodes of the Galactic warp model by Skowron et al. (2019) is also shown for reference (dotted gray line). The bottom panel shows the XZ view of the Mira distribution in the MW.