PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/22-21:27:50
G02     51.8           39.7                7.6 +/-    1.26      11.2 +/-    1.26  0.030 / 0.030
G05     74.4           67.1               10.4 +/-    0.62      11.2 +/-    0.62  0.030 / 0.030
G12     183.7          39.1               12.4 +/-    0.56      18.3 +/-    0.56  0.150 / 0.310
G13     134.3          9.6                -6.7 +/-    7.48     -18.7 +/-    7.48  0.240 / 0.390
G21     264.4          11.2                3.4 +/-   23.40       9.3 +/-   23.40  0.040 / 0.070
G25     250.5          56.7                9.5 +/-    2.47      11.1 +/-    2.47  0.040 / 0.080
G29     322.1          45.5               10.6 +/-    0.66      14.2 +/-    0.66  0.050 / 0.060