PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-18:43:00
G08     270.5          19.1                7.6 +/-    2.67      17.2 +/-    2.67  0.160 / 0.190
G10     54.7           60.0                8.9 +/-    0.65      10.1 +/-    0.65  0.170 / 0.190
G11     313.8          14.7                7.3 +/-    2.32      18.3 +/-    2.32  0.080 / 0.140
G14     261.0          64.4               10.5 +/-    1.06      11.5 +/-    1.06  0.090 / 0.130
G18     90.1           36.5                7.9 +/-    1.10      12.3 +/-    1.10  0.090 / 0.160
G21     152.5          13.3                8.9 +/-    3.14      23.1 +/-    3.14  0.260 / 0.270
G24     41.4           13.1                5.9 +/-    3.17      15.4 +/-    3.17  0.040 / 0.050
G27     232.8          17.4                9.2 +/-    2.44      21.6 +/-    2.44  0.040 / 0.050
G31     180.0          26.2               10.2 +/-    1.89      19.3 +/-    1.89  0.020 / 0.020
G32     324.7          75.2                9.9 +/-    0.28      10.2 +/-    0.28  0.030 / 0.020