Two days of neutral and ion measurements from ROSINA/COPS and DFMS. The measurements were taken 20 km from the comet, span all longitudes, and the latitude range from 0 to -46°. COPS measurements of the total neutral density at the spacecraft (green dots) show diurnal variations of up to a factor of 5 (ranging from ~1 × 10⁷ cm^-3 to 5 × 10⁷ cm^-3) with a six-hour period. DFMS observations of neutral H₂O (mass 18, with the intensity in arbitrary units) show the same diurnal variations. Ion measurements from 12 to 24 UT on 6 December 2014 and from 23 to 24 UT on 7 December 2014 are almost four orders of magnitude lower than the neutral signal. Accounting for differences in the efficiencies for detecting ions and neutrals, the ion density measured by DFMS is about 0.1 cm^-3.