PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/15-02:28:10
G01     52.2           26.8                2.1 +/-    2.43       3.9 +/-    2.43  0.040 / 0.040
G06     179.9          21.0                5.4 +/-    2.34      11.5 +/-    2.34  0.040 / 0.060
G07     145.6          14.9                5.6 +/-    1.51      14.0 +/-    1.51  0.030 / 0.020
G11     46.1           19.3                2.9 +/-    1.93       6.4 +/-    1.93  0.020 / 0.020
G13     254.0          31.6                3.3 +/-    3.52       5.5 +/-    3.52  0.120 / 0.140
G15     285.2          16.4                3.9 +/-    2.04       9.4 +/-    2.04  0.070 / 0.120
G17     293.9          78.3                5.2 +/-    0.38       5.3 +/-    0.38  0.120 / 0.250
G19     243.5          58.4                4.6 +/-    1.84       5.3 +/-    1.84  0.150 / 0.390
G28     49.8           53.4                5.1 +/-    0.99       6.2 +/-    0.99  0.100 / 0.150
G30     147.4          39.3                7.3 +/-    0.80      10.7 +/-    0.80  0.110 / 0.210