PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-20:27:30
G02     26.0           60.9                7.6 +/-    0.81       8.6 +/-    0.81  0.030 / 0.040
G05     146.9          57.5                9.4 +/-    0.73      10.9 +/-    0.73  0.040 / 0.040
G06     51.5           18.2                7.5 +/-    2.30      17.2 +/-    2.30  0.060 / 0.110
G12     197.8          71.3                9.1 +/-    0.44       9.5 +/-    0.44  0.050 / 0.080
G19     94.7           15.4                8.9 +/-    1.10      21.9 +/-    1.10  0.030 / 0.030
G25     303.5          50.2                7.7 +/-    3.23       9.7 +/-    3.23  0.030 / 0.030
G29     303.0          23.0                7.3 +/-    1.80      15.0 +/-    1.80  0.170 / 0.290