PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-18:43:00
G01     127.9          11.1               -3.8 +/-   48.92     -10.4 +/-   48.92  0.040 / 0.050
G07     48.1           69.8                9.9 +/-    0.32      10.5 +/-    0.32  0.060 / 0.050
G08     53.2           43.3                9.1 +/-    0.71      12.6 +/-    0.71  0.180 / 0.310
G09     178.7          37.6               13.8 +/-    0.93      20.9 +/-    0.93  0.100 / 0.300
G11     121.0          34.4               12.8 +/-    0.88      20.6 +/-    0.88  0.030 / 0.030
G13     321.5          10.5               -6.9 +/-   18.65     -19.0 +/-   18.65  0.040 / 0.040
G17     201.2          10.5               -1.0 +/-   36.12      -2.7 +/-   36.12  0.050 / 0.070
G18     105.2          16.1               12.3 +/-    2.12      29.8 +/-    2.12  0.050 / 0.080
G28     275.1          52.6               12.1 +/-    0.92      14.8 +/-    0.92  0.070 / 0.130
G30     333.8          60.8                9.6 +/-    1.12      10.8 +/-    1.12  0.080 / 0.110