PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-12:27:50
G01     112.9          21.9                5.5 +/-    0.73      11.6 +/-    0.73  0.070 / 0.190
G07     98.1           60.0                3.7 +/-    0.63       4.1 +/-    0.63  0.070 / 0.190
G08     42.6           23.9                3.1 +/-    0.72       6.2 +/-    0.72  0.100 / 0.170
G09     174.0          17.1                5.3 +/-    1.19      12.6 +/-    1.19  0.100 / 0.230
G11     95.2           40.3                4.7 +/-    0.80       6.8 +/-    0.80  0.030 / 0.040
G13     315.3          22.5               -1.1 +/-    2.14      -2.3 +/-    2.14  0.030 / 0.030
G17     202.8          33.8                6.1 +/-    1.14       9.9 +/-    1.14  0.070 / 0.110
G28     305.8          59.5                2.0 +/-    0.76       2.3 +/-    0.76  0.090 / 0.100
G30     355.6          72.4                2.4 +/-    0.75       2.5 +/-    0.75  0.040 / 0.090