PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-14:12:30
G02     219.2          58.6                5.7 +/-    0.75       6.5 +/-    0.75  0.110 / 0.090
G06     51.4           71.0                5.4 +/-    0.82       5.7 +/-    0.82  0.100 / 0.070
G12     320.2          41.5                6.0 +/-    1.16       8.5 +/-    1.16  0.050 / 0.060
G17     60.4           29.3                5.9 +/-    0.49      10.4 +/-    0.49  0.050 / 0.070
G19     37.1           51.0                5.9 +/-    0.61       7.3 +/-    0.61  0.050 / 0.040
G24     258.3          41.2                7.1 +/-    1.28      10.1 +/-    1.28  0.040 / 0.030
G28     124.1          12.5                8.5 +/-    1.81      22.3 +/-    1.81  0.040 / 0.050