PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-14:27:40
G02     357.2          76.2                9.2 +/-    0.82       9.5 +/-    0.82  0.040 / 0.090
G05     165.3          35.3               12.1 +/-    0.85      19.1 +/-    0.85  0.040 / 0.100
G06     42.1           39.3                7.3 +/-    1.22      10.8 +/-    1.22  0.020 / 0.040
G12     304.7          73.6                8.4 +/-    0.66       8.8 +/-    0.66  0.030 / 0.030
G19     79.6           23.6               10.4 +/-    1.40      21.1 +/-    1.40  0.090 / 0.110
G24     227.1          20.7               10.5 +/-    2.23      22.8 +/-    2.23  0.090 / 0.120
G25     316.3          34.1                9.3 +/-    1.47      15.0 +/-    1.47  0.040 / 0.050
G29     291.2          15.5                5.9 +/-    2.34      14.4 +/-    2.34  0.030 / 0.060