PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-15:57:40
G07     328.1          56.1               11.4 +/-    1.32      13.4 +/-    1.32  0.040 / 0.060
G08     107.4          51.3               13.0 +/-    0.48      16.1 +/-    0.48  0.030 / 0.050
G09     196.8          76.6               12.7 +/-    0.89      13.0 +/-    0.89  0.030 / 0.050
G11     148.3          11.2                9.6 +/-   14.10      26.2 +/-   14.10  0.030 / 0.060
G23     153.1          40.5               13.3 +/-    1.48      19.1 +/-    1.48  0.060 / 0.100
G27     57.7           32.9               10.0 +/-    0.56      16.4 +/-    0.56  0.100 / 0.120
G28     235.2          27.4               14.8 +/-    0.83      27.4 +/-    0.83  0.220 / 0.400
G30     300.1          33.7               11.9 +/-    0.81      19.4 +/-    0.81  0.210 / 0.400