PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-22:13:10
G07     333.5          58.1                8.2 +/-    0.58       9.5 +/-    0.58  0.030 / 0.050
G08     101.6          52.6               10.2 +/-    0.89      12.5 +/-    0.89  0.030 / 0.050
G09     193.9          73.7               10.4 +/-    0.98      10.8 +/-    0.98  0.080 / 0.180
G11     147.7          12.7               10.3 +/-    3.66      27.0 +/-    3.66  0.090 / 0.140
G23     155.2          39.4               10.8 +/-    0.53      15.9 +/-    0.53  0.070 / 0.080
G27     53.7           30.7                8.8 +/-    0.58      15.3 +/-    0.58  0.070 / 0.090
G28     238.2          30.8               10.2 +/-    1.83      17.5 +/-    1.83  0.030 / 0.050
G30     305.2          39.1                8.8 +/-    0.75      12.9 +/-    0.75  0.040 / 0.050