PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-06:27:50
G01     305.2          34.4                6.3 +/-    1.33      10.0 +/-    1.33  0.040 / 0.020
G10     107.4          39.9                5.5 +/-    0.42       8.0 +/-    0.42  0.040 / 0.030
G11     277.0          29.9                7.8 +/-    2.43      13.7 +/-    2.43  0.100 / 0.300
G14     4.8            65.3                4.3 +/-    0.97       4.7 +/-    0.97  0.110 / 0.300
G18     117.8          15.0                5.6 +/-    1.63      14.0 +/-    1.63  0.030 / 0.040
G22     310.4          28.4                3.9 +/-    1.58       7.1 +/-    1.58  0.040 / 0.050
G25     76.1           16.3                5.5 +/-    1.37      13.2 +/-    1.37  0.060 / 0.130
G31     164.5          67.1                7.2 +/-    1.08       7.8 +/-    1.08  0.080 / 0.140
G32     37.2           51.7                5.2 +/-    0.86       6.4 +/-    0.86  0.090 / 0.050