Radial velocity data from Kamper (1996) measured at DDO. Different symbols and colors are used to distinguish data measured using different instrumental setups. Labels “08”, “12”, and “16” refer to photographic of different dispersions (in mm Å⁻¹). “RE” refers to measurements taken using a Reticon detector, “CF” to ones using a fiber link, and “CE” to observations made using a CCD. Instrumental zero-point variations related to these interventions and associated calibration issues are readily apparent, especially following the peak of the orbital RV variation near HJD 2 445 750.