Citation:
Borsato L, Malavolta L, Piotto G, Buchhave L A, Mortier A, Rice K, Collier Cameron A, Coffinet A, Sozzetti A, Charbonneau D, et al. HARPS-N radial velocities confirm the low densities of the Kepler-9 planets. \mnras. 2019;484 (3) :3233-3243.