PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/13-19:27:40
G07     15.4           68.2               12.9 +/-    0.55      13.7 +/-    0.55  0.040 / 0.030
G08     67.1           51.2               13.1 +/-    1.03      16.3 +/-    1.03  0.040 / 0.020
G09     180.6          49.9               14.0 +/-    0.89      17.7 +/-    0.89  0.170 / 0.300
G11     131.7          27.2               13.0 +/-    0.87      24.2 +/-    0.87  0.190 / 0.450
G18     114.9          10.3                4.8 +/-   31.67      13.2 +/-   31.67  0.190 / 0.420
G23     158.7          15.5               14.8 +/-    1.47      36.3 +/-    1.47  0.280 / 0.320
G27     40.1           16.4                9.6 +/-    1.81      23.0 +/-    1.81  0.030 / 0.010
G28     259.8          46.1               13.2 +/-    2.97      17.5 +/-    2.97  0.040 / 0.020
G30     322.6          52.5               11.0 +/-    0.70      13.4 +/-    0.70  0.040 / 0.010