Two examples that illustrates the performance of the cross-calibration. Top: 31 Dec 2014, when the MIP instrument (blue dots) was occasionally in a measurement mode that is not sensitive to low densities, but LAP1 was continuously measuring spacecraft potential, and recovers the density via cross-calibration to spacecraft potential (red line). The errors in the cross-calibration are dominated by uncertainties in the MIP and are typically 25% in both datasets. Bottom: time resolution of the electron density dataset is also improved, here via a ∼60 Hz ion current cross-calibration as described in Sect. 4.3.