PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/28-08:12:50
G07     338.9          59.8                5.7 +/-    0.77       6.5 +/-    0.77  0.040 / 0.050
G08     93.0           51.5                9.6 +/-    0.93      11.9 +/-    0.93  0.050 / 0.070
G09     184.5          70.5               10.6 +/-    0.64      11.2 +/-    0.64  0.030 / 0.040
G11     143.1          14.0                7.0 +/-    2.31      17.8 +/-    2.31  0.030 / 0.040
G23     156.6          41.7               11.5 +/-    0.47      16.3 +/-    0.47  0.100 / 0.090
G27     52.6           29.8                5.1 +/-    1.71       9.0 +/-    1.71  0.090 / 0.110
G28     239.1          31.4                7.9 +/-    1.04      13.4 +/-    1.04  0.050 / 0.030
G30     302.7          35.3                6.7 +/-    1.95      10.7 +/-    1.95  0.040 / 0.040