PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-21:57:50
G01     229.3          19.8                9.1 +/-    3.45      20.1 +/-    3.45  0.030 / 0.030
G03     295.1          65.5                9.4 +/-    0.73      10.3 +/-    0.73  0.030 / 0.030
G14     83.2           26.7                9.3 +/-    1.49      17.5 +/-    1.49  0.070 / 0.070
G16     153.4          39.7               10.1 +/-    0.79      14.8 +/-    0.79  0.050 / 0.060
G22     229.1          73.6               10.5 +/-    0.49      10.9 +/-    0.49  0.070 / 0.090
G23     304.2          34.2                8.1 +/-    2.68      13.0 +/-    2.68  0.080 / 0.090
G26     107.1          53.5               10.0 +/-    0.39      12.1 +/-    0.39  0.090 / 0.130
G31     43.3           36.9                8.8 +/-    1.65      13.4 +/-    1.65  0.100 / 0.130