PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/10/20-11:57:40
G02     214.5          54.7                6.6 +/-    0.85       7.9 +/-    0.85  0.070 / 0.070
G06     66.1           76.4                5.2 +/-    0.69       5.4 +/-    0.69  0.050 / 0.080
G12     317.9          34.9                3.9 +/-    1.42       6.3 +/-    1.42  0.050 / 0.090
G17     56.2           32.3                3.3 +/-    0.88       5.5 +/-    0.88  0.050 / 0.110
G19     30.9           53.8                4.6 +/-    0.53       5.5 +/-    0.53  0.030 / 0.030
G24     264.8          42.9                4.4 +/-    1.36       6.1 +/-    1.36  0.030 / 0.020
G28     120.2          17.0                5.3 +/-    1.31      12.5 +/-    1.31  0.030 / 0.050