PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-18:28:10
G07     339.0          60.1               12.1 +/-    0.77      13.7 +/-    0.77  0.050 / 0.100
G08     97.7           53.9               13.3 +/-    0.64      16.0 +/-    0.64  0.060 / 0.090
G09     188.0          69.4               12.3 +/-    0.59      13.1 +/-    0.59  0.050 / 0.090
G11     144.3          15.5               16.3 +/-    2.85      40.0 +/-    2.85  0.050 / 0.110
G23     155.4          32.7               14.7 +/-    0.67      24.4 +/-    0.67  0.150 / 0.400
G27     50.7           28.8                9.8 +/-    1.61      17.7 +/-    1.61  0.140 / 0.370
G28     241.3          33.4               15.6 +/-    1.74      25.5 +/-    1.74  0.060 / 0.130
G30     306.8          39.6               10.3 +/-    0.85      15.1 +/-    0.85  0.060 / 0.150