PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/12-14:57:20
G02     205.8          40.1               12.4 +/-    1.17      18.1 +/-    1.17  0.030 / 0.060
G06     148.1          75.3               10.3 +/-    1.18      10.7 +/-    1.18  0.030 / 0.060
G12     311.3          20.5                9.3 +/-    1.11      20.2 +/-    1.11  0.110 / 0.250
G17     44.4           42.1                8.2 +/-    0.39      11.5 +/-    0.39  0.140 / 0.180
G19     18.4           59.8                8.6 +/-    0.63       9.8 +/-    0.63  0.030 / 0.030
G24     292.1          39.9                8.5 +/-    1.40      12.4 +/-    1.40  0.040 / 0.030
G28     109.2          26.1               11.2 +/-    1.02      21.3 +/-    1.02  0.050 / 0.090