Panel a: clock angle of the solar wind protons and the estimated upstream magnetic field in the CSEQ frame. Panel b: angular difference (clock angle) between the observed magnetic field and the solar wind protons. Panels c and d: angular difference between the solar wind protons and the spacecraft, and the protons and the cometary ions, respectively. Panels e and f: departure of the cometary ion flow direction from the purely radial direction for the cone and clock angle, respectively.