PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-19:42:40
G02     343.0          78.0                9.1 +/-    0.62       9.3 +/-    0.62  0.040 / 0.090
G05     163.4          35.5               14.6 +/-    1.42      23.0 +/-    1.42  0.040 / 0.080
G06     42.6           36.7                8.2 +/-    0.55      12.6 +/-    0.55  0.030 / 0.030
G12     304.3          76.7                9.5 +/-    0.69       9.8 +/-    0.69  0.020 / 0.040
G17     87.7           10.2                9.0 +/-    1.03      24.9 +/-    1.03  0.080 / 0.160
G19     75.2           28.6                9.0 +/-    0.77      16.2 +/-    0.77  0.090 / 0.150
G24     225.6          21.0               12.7 +/-    1.77      27.2 +/-    1.77  0.080 / 0.120
G25     316.8          31.0                8.5 +/-    1.15      14.6 +/-    1.15  0.070 / 0.130