PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/17-21:12:40
G02     38.6           50.9                9.7 +/-    1.34      12.0 +/-    1.34  0.040 / 0.030
G05     122.0          67.4                9.3 +/-    0.48      10.0 +/-    0.48  0.040 / 0.030
G12     187.9          57.0               10.4 +/-    0.47      12.1 +/-    0.47  0.050 / 0.050
G25     283.7          57.4                6.2 +/-    4.23       7.2 +/-    4.23  0.040 / 0.050
G29     311.8          32.4                6.9 +/-    1.61      11.5 +/-    1.61  0.040 / 0.040