PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/22-20:28:00
G02     55.0           37.3               10.6 +/-    1.02      16.1 +/-    1.02  0.040 / 0.070
G05     73.4           69.1               10.5 +/-    0.75      11.1 +/-    0.75  0.040 / 0.090
G12     185.8          36.7               13.8 +/-    3.47      21.2 +/-    3.47  0.030 / 0.060
G13     133.1          12.1               14.4 +/-    2.90      38.3 +/-    2.90  0.040 / 0.060
G20     204.8          56.3               12.7 +/-    0.92      15.0 +/-    0.92  0.120 / 0.330
G21     267.7          15.1               13.8 +/-    1.47      34.4 +/-    1.47  0.110 / 0.400
G25     236.0          54.1               11.6 +/-    1.17      14.0 +/-    1.17  0.030 / 0.030