PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-18:27:50
G01     104.4          27.0               12.7 +/-    1.19      23.8 +/-    1.19  0.130 / 0.320
G07     110.7          56.6               12.8 +/-    0.47      15.0 +/-    0.47  0.150 / 0.290
G08     42.0           20.1                8.1 +/-    0.97      17.8 +/-    0.97  0.040 / 0.090
G09     174.4          11.4               13.6 +/-    2.00      36.8 +/-    2.00  0.040 / 0.110
G11     86.4           43.1               11.5 +/-    0.69      15.9 +/-    0.69  0.030 / 0.050
G13     307.5          30.1               11.5 +/-    1.32      20.1 +/-    1.32  0.030 / 0.050
G17     207.9          37.6               15.3 +/-    1.07      23.2 +/-    1.07  0.030 / 0.030
G18     77.8           24.7               10.6 +/-    1.11      20.9 +/-    1.11  0.030 / 0.040
G28     323.8          61.4               11.1 +/-    1.19      12.5 +/-    1.19  0.100 / 0.170
G30     41.7           79.1               11.9 +/-    0.57      12.1 +/-    0.57  0.100 / 0.170