PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-20:57:30
G02     39.0           50.5                7.8 +/-    1.29       9.8 +/-    1.29  0.030 / 0.030
G05     120.6          67.7                9.2 +/-    0.52       9.8 +/-    0.52  0.040 / 0.030
G12     187.4          56.2                9.8 +/-    0.42      11.5 +/-    0.42  0.040 / 0.040
G25     282.3          57.7               10.8 +/-    3.76      12.6 +/-    3.76  0.030 / 0.050
G29     312.2          32.9                6.1 +/-    1.17      10.1 +/-    1.17  0.040 / 0.040