PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-12:42:40
G02     201.8          17.6                3.5 +/-    0.65       8.1 +/-    0.65  0.130 / 0.200
G06     169.0          55.3                4.5 +/-    1.02       5.3 +/-    1.02  0.160 / 0.230
G13     226.5          12.8                3.5 +/-    2.22       9.2 +/-    2.22  0.090 / 0.110
G17     24.5           58.1                4.3 +/-    0.85       4.9 +/-    0.85  0.100 / 0.110
G19     309.2          69.8                2.1 +/-    1.13       2.3 +/-    1.13  0.030 / 0.040
G24     308.1          32.2                3.5 +/-    1.16       5.8 +/-    1.16  0.040 / 0.050
G28     87.9           40.2                4.5 +/-    1.05       6.5 +/-    1.05  0.250 / 0.630
G30     157.8          15.5                4.8 +/-    2.44      11.7 +/-    2.44  0.130 / 0.510