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                9.3 +/-    2.42      14.5 +/-    2.42  0.030 / 0.030
G03     316.1          42.5                7.8 +/-    1.02      10.9 +/-    1.02  0.030 / 0.030
G11     239.0          13.6                8.5 +/-    1.72      21.9 +/-    1.72  0.020 / 0.030
G14     59.0           41.5                6.5 +/-    1.65       9.2 +/-    1.65  0.020 / 0.030
G22     306.7          64.3                6.9 +/-    0.83       7.6 +/-    0.83  0.100 / 0.260
G23     285.3          18.0                9.9 +/-    1.92      23.0 +/-    1.92  0.100 / 0.250
G25     40.7           10.8                7.6 +/-    4.52      20.9 +/-    4.52  0.060 / 0.090
G26     139.6          36.2               11.6 +/-    0.65      18.0 +/-    0.65  0.060 / 0.100
G31     40.8           61.8                6.0 +/-    0.55       6.8 +/-    0.55  0.050 / 0.080
G32     75.9           24.4                8.6 +/-    0.91      17.1 +/-    0.91  0.050 / 0.080