Geometric optical depth and number density of lunar-ejected particles relative to the Earth-Moon orbital plane, where the x-axis points to the ascending node of the Moon at the J2000 epoch, the z-axis is along the normal of the orbital plane (north), and the y-axis is determined by the right-handed rule. Panel a: normal geometric optical depth. Panel b: Azimuth-averaged number density in the ρ-z plane, where $\rho =\sqrt{x^2+y^2}$. The blue circle denotes Earth, and the red line denotes the orbit of Moon.