Radial velocity curve of KIC 7821010. The RV data from Helminiak et al. (2019) are shown with blue and red squares and the orbital solution with dotted blue and red lines for the primary and secondary component, respectively. The LAMOST MRS RVs derived in this work are overplotted with filled black circles for the primary and open circles for the secondary component, respectively. The green x symbols display the RV values measured by us near the conjunctions, where a single peak is visible in the CCF.