K_p–V_sys S/N map of H-spec with a maximum peak at K_p = +237.5 ﹩{}_{-5.0}^{+13.0}﹩ km s⁻¹ and ﹩{V}_{\mathrm{sys}}=-{1.5}_{-10.5}^{+4.0}﹩ km s⁻¹, which gives a 4.8σ detection. The white dashed line is the expected K_p and V_sys from previous studies. The top and right panels show the one-dimensional cross-section of the CCF peak along V_sys and K_p, respectively. The black dashed lines show the most significant signal, the white dashed lines show the expected K_p and V_sys, and the color bar grid interval is 1σ, and the white area also represents the 1σ error of the detected signal.