PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-21:42:50
G01     252.8          36.0                7.0 +/-    1.01      11.0 +/-    1.01  0.030 / 0.050
G03     316.1          42.5                5.0 +/-    1.43       7.0 +/-    1.43  0.030 / 0.060
G11     239.0          13.6                9.6 +/-    1.79      24.7 +/-    1.79  0.060 / 0.100
G14     59.0           41.5                5.8 +/-    1.19       8.3 +/-    1.19  0.050 / 0.100
G22     306.7          64.3                5.3 +/-    0.67       5.8 +/-    0.67  0.110 / 0.280
G23     285.3          18.0                9.2 +/-    1.39      21.3 +/-    1.39  0.120 / 0.370
G25     40.7           10.8                6.8 +/-    2.05      18.6 +/-    2.05  0.030 / 0.050
G26     139.6          36.2               12.3 +/-    1.01      19.1 +/-    1.01  0.040 / 0.050
G31     40.8           61.8                4.7 +/-    0.39       5.2 +/-    0.39  0.050 / 0.120
G32     75.9           24.4                8.6 +/-    0.55      17.1 +/-    0.55  0.070 / 0.130