PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/07-17:28:00
G07     352.6          64.1               10.3 +/-    0.66      11.3 +/-    0.66  0.030 / 0.050
G08     81.8           53.6               10.9 +/-    0.50      13.2 +/-    0.50  0.030 / 0.050
G09     182.7          60.6               13.9 +/-    1.04      15.7 +/-    1.04  0.040 / 0.040
G11     138.7          20.7               13.6 +/-    1.94      29.5 +/-    1.94  0.040 / 0.050
G23     157.0          24.4               13.9 +/-    2.04      27.6 +/-    2.04  0.090 / 0.180
G27     45.2           23.9                7.7 +/-    0.77      15.4 +/-    0.77  0.050 / 0.180
G28     248.5          39.1               15.9 +/-    1.58      23.4 +/-    1.58  0.060 / 0.110
G30     312.8          44.4                9.7 +/-    0.89      13.2 +/-    0.89  0.050 / 0.120