Fig. 7From: Feasibility analysis of GNSS-based ionospheric observation on a fast-moving train platform (GIFT)TECR derived from six test datasets on carrier phase measurements. They were collected on the moving MTR train and showed in (a–f). The MTRS170x implies that TECR was observed on the MTR train and were derived from the x-th session on the 170th day of yearBack to article page