PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/15-14:27:50
G02     52.6           38.2                7.1 +/-    1.70      10.7 +/-    1.70  0.020 / 0.020
G05     81.5           69.0                9.3 +/-    0.37       9.9 +/-    0.37  0.030 / 0.020
G12     188.6          44.2               12.7 +/-    0.83      17.3 +/-    0.83  0.110 / 0.450
G20     204.2          47.9               13.2 +/-    0.55      17.1 +/-    0.55  0.160 / 0.320
G21     264.7          14.6                6.7 +/-    2.34      16.7 +/-    2.34  0.040 / 0.060
G25     252.0          57.2               10.2 +/-    1.72      11.9 +/-    1.72  0.040 / 0.060
G29     326.1          50.9                6.7 +/-    1.02       8.4 +/-    1.02  0.050 / 0.050