PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-12:27:30
G01     38.1           11.0                3.0 +/-    1.38       8.1 +/-    1.38  0.070 / 0.190
G02     201.1          11.2               -1.2 +/-    5.66      -3.2 +/-    5.66  0.080 / 0.210
G06     171.8          47.8                3.7 +/-    1.78       4.8 +/-    1.78  0.100 / 0.160
G13     231.5          17.3                4.6 +/-    7.74      10.9 +/-    7.74  0.100 / 0.140
G17     16.6           63.6                1.7 +/-    0.95       1.8 +/-    0.95  0.150 / 0.310
G19     287.9          68.5                1.4 +/-    0.91       1.4 +/-    0.91  0.180 / 0.350
G24     312.4          27.2                5.3 +/-    2.00       9.9 +/-    2.00  0.040 / 0.080
G28     79.8           44.0                3.3 +/-    1.19       4.5 +/-    1.19  0.050 / 0.080
G30     156.8          22.0                4.4 +/-    1.02       9.3 +/-    1.02  0.140 / 0.670