PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-20:13:10
G01     298.2          37.8                8.2 +/-    2.42      12.4 +/-    2.42  0.060 / 0.090
G03     309.7          12.4                7.5 +/-    3.92      19.9 +/-    3.92  0.060 / 0.080
G10     114.5          34.0                9.2 +/-    1.68      14.9 +/-    1.68  0.080 / 0.140
G11     272.8          27.5                9.8 +/-    2.07      18.1 +/-    2.07  0.130 / 0.120
G14     14.4           62.3                7.2 +/-    0.96       8.0 +/-    0.96  0.020 / 0.020
G22     312.3          32.6                8.6 +/-    1.72      14.2 +/-    1.72  0.020 / 0.020
G25     73.0           18.5                7.5 +/-    2.56      17.1 +/-    2.56  0.030 / 0.040
G31     158.2          73.5               10.4 +/-    0.29      10.8 +/-    0.29  0.030 / 0.040
G32     44.6           46.8                6.7 +/-    0.68       8.8 +/-    0.68  0.040 / 0.050