PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-18:57:30
G01     88.8           32.2               11.3 +/-    1.14      19.0 +/-    1.14  0.100 / 0.190
G07     126.6          44.9               13.1 +/-    0.83      17.7 +/-    0.83  0.120 / 0.150
G11     68.2           39.9               10.8 +/-    1.39      15.8 +/-    1.39  0.030 / 0.030
G13     293.4          36.2               12.5 +/-    3.85      19.4 +/-    3.85  0.030 / 0.030
G17     216.0          51.6               15.9 +/-    0.76      19.7 +/-    0.76  0.070 / 0.160
G18     63.0           23.8                9.6 +/-    1.36      19.3 +/-    1.36  0.060 / 0.120
G19     215.3          26.7               14.1 +/-    1.89      26.4 +/-    1.89  0.050 / 0.040
G28     351.9          61.6               10.6 +/-    0.42      11.9 +/-    0.42  0.060 / 0.050
G30     109.1          74.4               13.2 +/-    0.67      13.6 +/-    0.67  0.050 / 0.070