PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/19-07:57:50
G01     66.6           32.2                3.6 +/-    0.72       6.0 +/-    0.72  0.040 / 0.050
G07     139.3          26.8                7.7 +/-    1.46      14.5 +/-    1.46  0.030 / 0.050
G11     51.5           27.7                1.9 +/-    0.66       3.5 +/-    0.66  0.090 / 0.310
G13     271.8          36.5                5.3 +/-    1.53       8.2 +/-    1.53  0.130 / 0.280
G15     299.3          16.1                2.3 +/-    2.52       5.6 +/-    2.52  0.040 / 0.040
G17     242.9          73.7                5.9 +/-    0.47       6.2 +/-    0.47  0.030 / 0.030
G19     227.3          46.9                5.9 +/-    1.65       7.7 +/-    1.65  0.070 / 0.110
G28     26.9           58.1                2.9 +/-    0.58       3.4 +/-    0.58  0.040 / 0.100
G30     138.4          57.7                6.1 +/-    1.10       7.0 +/-    1.10  0.040 / 0.080