PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-03:13:00
G02     199.5          22.3                6.4 +/-    1.93      13.3 +/-    1.93  0.050 / 0.080
G06     173.5          51.9                6.7 +/-    0.69       8.3 +/-    0.69  0.060 / 0.080
G13     228.2          13.3                3.8 +/-    3.10       9.8 +/-    3.10  0.040 / 0.040
G17     19.0           61.3                4.1 +/-    0.77       4.6 +/-    0.77  0.030 / 0.040
G19     323.1          71.1                3.0 +/-    0.47       3.1 +/-    0.47  0.030 / 0.040
G24     310.8          28.7                1.9 +/-    1.19       3.3 +/-    1.19  0.030 / 0.040
G28     88.2           39.4                4.6 +/-    0.92       6.8 +/-    0.92  0.220 / 0.620
G30     155.8          11.4                7.1 +/-    3.52      19.2 +/-    3.52  0.100 / 0.370