PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/21-08:27:50
G01     49.4           24.9                5.1 +/-    2.46      10.1 +/-    2.46  0.040 / 0.040
G06     180.3          23.0                6.0 +/-    3.18      12.2 +/-    3.18  0.040 / 0.050
G07     146.4          10.9                5.6 +/-    2.37      15.4 +/-    2.37  0.100 / 0.240
G11     44.5           14.0                3.0 +/-    1.11       7.7 +/-    1.11  0.160 / 0.340
G13     251.3          29.8                5.6 +/-    1.42       9.8 +/-    1.42  0.020 / 0.020
G15     282.6          15.8                4.0 +/-    1.21       9.6 +/-    1.21  0.030 / 0.020
G17     327.1          78.2                6.5 +/-    0.42       6.6 +/-    0.42  0.100 / 0.170
G19     249.7          62.3                6.3 +/-    0.72       7.0 +/-    0.72  0.090 / 0.230
G28     54.7           52.1                4.8 +/-    0.69       6.0 +/-    0.69  0.110 / 0.090
G30     149.7          39.9                8.9 +/-    0.75      12.9 +/-    0.75  0.110 / 0.100