PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-17:12:50
G02     31.6           57.1               11.0 +/-    0.93      12.9 +/-    0.93  0.060 / 0.050
G05     149.5          59.3               14.6 +/-    0.47      16.7 +/-    0.47  0.050 / 0.040
G06     53.1           17.8                9.1 +/-    3.02      21.2 +/-    3.02  0.020 / 0.030
G12     202.3          69.2               13.5 +/-    0.91      14.3 +/-    0.91  0.020 / 0.030
G20     198.2          25.4               11.7 +/-    3.27      22.7 +/-    3.27  0.100 / 0.380
G25     295.6          55.2               10.5 +/-    4.10      12.5 +/-    4.10  0.140 / 0.250
G29     308.6          30.7               11.4 +/-    1.42      19.6 +/-    1.42  0.030 / 0.040