PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/23-14:27:40
G02     201.0          14.2                8.9 +/-    2.28      22.6 +/-    2.28  0.080 / 0.310
G06     169.5          51.3                9.4 +/-    1.17      11.6 +/-    1.17  0.090 / 0.310
G13     229.8          15.7                7.8 +/-    2.92      19.1 +/-    2.92  0.070 / 0.140
G17     19.7           61.7                6.8 +/-    0.51       7.6 +/-    0.51  0.080 / 0.130
G19     297.2          69.7                7.0 +/-    1.46       7.5 +/-    1.46  0.050 / 0.120
G24     311.6          28.2                5.9 +/-    1.51      10.7 +/-    1.51  0.040 / 0.090
G28     83.0           42.1                5.9 +/-    1.14       8.3 +/-    1.14  0.030 / 0.040
G30     157.2          20.0                9.0 +/-    2.18      19.8 +/-    2.18  0.040 / 0.030