PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-19:12:40
G02     17.3           66.8               11.6 +/-    0.60      12.5 +/-    0.60  0.030 / 0.020
G05     160.0          48.4               14.3 +/-    0.83      18.4 +/-    0.83  0.020 / 0.020
G06     48.3           24.9                9.4 +/-    1.88      18.4 +/-    1.88  0.070 / 0.070
G12     227.8          78.1                9.8 +/-    0.57      10.0 +/-    0.57  0.080 / 0.070
G19     91.8           15.0               11.7 +/-    1.82      29.0 +/-    1.82  0.250 / 0.540
G20     197.2          16.2               19.5 +/-    3.38      47.1 +/-    3.38  0.350 / 0.600
G24     217.2          11.1               16.2 +/-    2.71      44.2 +/-    2.71  0.050 / 0.040
G25     307.3          49.2               10.5 +/-    0.84      13.3 +/-    0.84  0.030 / 0.040
G29     300.3          22.0               11.5 +/-    1.85      24.2 +/-    1.85  0.070 / 0.170