ROSINA DFMS timeline of CO, NH₃, CN, F, Na, and ²⁸Si signals (left y-axis), measured between 31 July and 2 August 2015. Fragmentation of HCN → CN has beensubtracted from the CN signal. The solid black line marks the off-nadir angle (right y-axis) including the two great circle scans on 31 July 2015. The cometocentric distance was ~200 km. For most of 1 August 2015 no neutral gas data is available as DFMS was operated in ion mode.