Fig. 1From: Comparison of different methods to account for the plasmaspheric electron content in GNSS-derived ionospheric altimeter corrections and their impact on sea level trend estimationThree different ionospheric corrections (unscaled GIM model in blue, dual-frequency altimeter correction in grey and black, and correction fitted by machine learning approach a simple regression tree in yellow and boosted ensemble trees in red) for four different pole-to-pole overflights (two cycles and two passes) outside the training periodBack to article page