PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-16:28:10
G02     205.6          37.5               12.9 +/-    0.94      19.6 +/-    0.94  0.070 / 0.060
G03     54.3           9.6                 8.6 +/-    1.12      24.2 +/-    1.12  0.090 / 0.060
G06     149.2          74.3               12.4 +/-    0.56      12.8 +/-    0.56  0.090 / 0.220
G12     310.9          20.0                9.5 +/-    1.39      20.8 +/-    1.39  0.170 / 0.180
G17     43.4           43.0               10.1 +/-    1.83      13.9 +/-    1.83  0.040 / 0.060
G19     16.4           60.6               11.3 +/-    0.79      12.7 +/-    0.79  0.030 / 0.060
G24     293.8          39.4               10.2 +/-    4.61      14.9 +/-    4.61  0.090 / 0.230
G28     108.0          27.2               10.4 +/-    1.17      19.4 +/-    1.17  0.080 / 0.180