PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-23:27:50
G03     224.3          64.0                8.3 +/-    0.72       9.2 +/-    0.72  0.040 / 0.050
G07     251.9          11.1               -3.5 +/-   18.33      -9.4 +/-   18.33  0.040 / 0.050
G09     306.6          22.2                6.9 +/-    3.14      14.3 +/-    3.14  0.220 / 0.120
G14     104.7          10.4                7.1 +/-    2.16      19.6 +/-    2.16  0.220 / 0.200
G16     122.1          62.9                7.6 +/-    0.45       8.4 +/-    0.45  0.040 / 0.030
G22     192.1          49.7                8.5 +/-    0.84      10.7 +/-    0.84  0.040 / 0.040
G23     323.6          53.4                5.8 +/-    0.64       7.0 +/-    0.64  0.230 / 0.370
G26     62.3           49.8                5.3 +/-    1.15       6.8 +/-    1.15  0.240 / 0.320
G31     54.9           16.6                4.9 +/-    1.51      11.8 +/-    1.51  0.090 / 0.120