PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/31-15:27:30
G02     51.9           39.0                8.6 +/-    0.55      12.8 +/-    0.55  0.020 / 0.030
G05     84.9           69.7               11.4 +/-    0.38      12.1 +/-    0.38  0.030 / 0.030
G12     188.6          44.7               12.9 +/-    1.48      17.5 +/-    1.48  0.160 / 0.350
G20     203.7          47.7               12.1 +/-    1.87      15.7 +/-    1.87  0.130 / 0.310
G21     264.0          13.6               11.6 +/-    1.42      30.0 +/-    1.42  0.040 / 0.070
G25     252.3          57.5               13.4 +/-    0.59      15.5 +/-    0.59  0.050 / 0.090
G29     326.1          50.9               10.7 +/-    1.01      13.4 +/-    1.01  0.050 / 0.050