PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-17:27:50
G01     121.0          16.5               13.8 +/-    2.12      33.0 +/-    2.12  0.050 / 0.070
G07     73.9           67.8               13.9 +/-    0.39      14.8 +/-    0.39  0.050 / 0.070
G08     46.6           35.3               11.8 +/-    0.95      18.7 +/-    0.95  0.030 / 0.040
G09     177.3          28.2               14.2 +/-    1.62      25.9 +/-    1.62  0.030 / 0.040
G11     110.6          39.0               14.5 +/-    0.88      21.5 +/-    0.88  0.030 / 0.030
G13     318.7          17.6               13.8 +/-    1.98      32.2 +/-    1.98  0.030 / 0.030
G17     202.1          19.8               15.7 +/-    1.22      34.8 +/-    1.22  0.150 / 0.290
G18     96.9           20.0               12.7 +/-    1.06      28.0 +/-    1.06  0.170 / 0.230
G28     289.1          56.6               13.7 +/-    1.53      16.1 +/-    1.53  0.090 / 0.210
G30     344.4          67.3               13.2 +/-    0.37      14.2 +/-    0.37  0.110 / 0.250