PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-18:12:30
G02     213.6          54.6               13.1 +/-    1.02      15.6 +/-    1.02  0.050 / 0.110
G06     65.9           75.6               10.5 +/-    0.69      10.9 +/-    0.69  0.050 / 0.070
G12     318.3          36.0                7.4 +/-    0.95      11.5 +/-    0.95  0.060 / 0.090
G17     54.3           34.7                7.9 +/-    0.92      12.6 +/-    0.92  0.070 / 0.070
G19     31.0           53.8                9.3 +/-    0.35      11.2 +/-    0.35  0.090 / 0.300
G24     268.8          42.6                9.5 +/-    1.12      13.2 +/-    1.12  0.080 / 0.320
G28     120.0          16.5                9.3 +/-    2.22      22.3 +/-    2.22  0.040 / 0.060