PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-18:42:50
G02     359.2          74.5                9.4 +/-    0.54       9.7 +/-    0.54  0.050 / 0.080
G05     165.5          38.2                8.9 +/-    0.84      13.4 +/-    0.84  0.060 / 0.090
G06     44.3           33.2                7.5 +/-    0.43      12.3 +/-    0.43  0.210 / 0.330
G12     286.3          78.4                8.0 +/-    0.40       8.2 +/-    0.40  0.200 / 0.330
G19     83.6           20.8                8.7 +/-    1.04      18.8 +/-    1.04  0.030 / 0.040
G24     224.0          17.7               12.1 +/-    2.52      28.0 +/-    2.52  0.030 / 0.030
G25     314.1          40.5               10.1 +/-    2.72      14.6 +/-    2.72  0.150 / 0.390
G29     293.2          15.7                9.3 +/-    1.88      22.7 +/-    1.88  0.110 / 0.390