PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-17:12:40
G01     255.1          36.9                8.6 +/-    1.77      13.3 +/-    1.77  0.030 / 0.040
G03     316.4          44.0                6.9 +/-    1.32       9.5 +/-    1.32  0.030 / 0.040
G11     242.7          14.5                8.6 +/-    2.71      21.6 +/-    2.71  0.050 / 0.080
G14     55.6           44.1                6.6 +/-    1.62       9.0 +/-    1.62  0.050 / 0.070
G22     307.5          64.9                8.4 +/-    0.45       9.2 +/-    0.45  0.070 / 0.120
G23     284.9          18.7                9.2 +/-    1.76      20.9 +/-    1.76  0.100 / 0.150
G25     42.7           12.4                5.7 +/-    3.15      15.1 +/-    3.15  0.030 / 0.030
G31     41.9           61.0                7.1 +/-    0.49       8.0 +/-    0.49  0.030 / 0.030
G32     75.1           24.2                8.1 +/-    1.71      16.2 +/-    1.71  0.050 / 0.060