PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-17:12:50
G02     48.3           43.1                8.8 +/-    0.89      12.1 +/-    0.89  0.030 / 0.030
G05     88.0           70.4                7.7 +/-    0.40       8.1 +/-    0.40  0.020 / 0.030
G12     184.4          42.0                9.1 +/-    1.43      12.8 +/-    1.43  0.120 / 0.520
G21     263.1          10.7               -2.1 +/-   17.30      -5.7 +/-   17.30  0.130 / 0.550
G25     251.1          57.8               10.3 +/-    0.56      11.9 +/-    0.56  0.060 / 0.070
G29     321.1          44.1                8.2 +/-    1.06      11.2 +/-    1.06  0.050 / 0.080