PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-19:27:50
G01     316.3          23.2                7.4 +/-    2.53      15.1 +/-    2.53  0.130 / 0.290
G10     89.0           50.0                9.3 +/-    0.66      11.7 +/-    0.66  0.110 / 0.410
G11     297.6          25.4               10.5 +/-    1.37      20.4 +/-    1.37  0.100 / 0.140
G14     318.5          71.0                9.4 +/-    0.73       9.9 +/-    0.73  0.100 / 0.160
G18     107.9          22.8                7.7 +/-    1.70      15.8 +/-    1.70  0.130 / 0.400
G22     303.7          14.8                9.9 +/-    2.34      24.7 +/-    2.34  0.150 / 0.320
G25     95.3           11.4                9.0 +/-    2.63      24.3 +/-    2.63  0.040 / 0.090
G31     175.9          48.1               11.2 +/-    1.76      14.4 +/-    1.76  0.050 / 0.050
G32     17.3           63.2                8.6 +/-    0.37       9.6 +/-    0.37  0.070 / 0.060