PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/25-17:57:20
G02     52.1           39.3               14.9 +/-    0.77      22.0 +/-    0.77  0.050 / 0.070
G05     85.9           70.6               16.0 +/-    0.67      16.8 +/-    0.67  0.050 / 0.060
G12     187.7          42.8               16.0 +/-    1.52      22.3 +/-    1.52  0.270 / 0.520
G20     203.4          50.1               18.2 +/-    1.43      22.9 +/-    1.43  0.230 / 0.350
G21     264.4          13.0               14.1 +/-    7.85      36.9 +/-    7.85  0.080 / 0.090
G25     247.3          57.1               16.6 +/-    0.60      19.4 +/-    0.60  0.040 / 0.070
G29     325.3          50.1               15.9 +/-    0.80      20.1 +/-    0.80  0.070 / 0.050