Fig. 4

Plasma density measurements derived from RPC-MIP active (blue) and passive (red) modes. The instrument was operating inSDL anti-phase submode. Both panels show examples of the measurement uncertainties for one passive and one active density observation; these are highlighted with black rectangles. The cometocentric distance of Rosetta was around 207 km on August 2, 2015, and 334 km on September 8, 2015.
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