PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-03:43:10
G01     66.9           32.3                4.2 +/-    1.18       6.9 +/-    1.18  0.030 / 0.050
G07     139.3          27.9                6.5 +/-    1.02      11.9 +/-    1.02  0.030 / 0.050
G11     52.6           29.6                4.1 +/-    0.75       7.2 +/-    0.75  0.030 / 0.040
G13     271.5          36.7                5.3 +/-    0.92       8.1 +/-    0.92  0.030 / 0.040
G15     298.9          16.3                3.1 +/-    2.42       7.4 +/-    2.42  0.050 / 0.130
G17     240.5          71.6                5.8 +/-    0.77       6.0 +/-    0.77  0.050 / 0.110
G19     227.1          46.0                6.5 +/-    1.08       8.7 +/-    1.08  0.080 / 0.320
G28     26.7           58.1                3.0 +/-    0.53       3.4 +/-    0.53  0.110 / 0.250
G30     138.2          55.1                6.7 +/-    0.76       7.9 +/-    0.76  0.060 / 0.090