PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-03:43:10
G01     64.8           31.9                5.3 +/-    0.66       8.9 +/-    0.66  0.030 / 0.060
G07     140.3          26.2                7.9 +/-    1.36      15.0 +/-    1.36  0.040 / 0.060
G11     51.4           28.3                3.8 +/-    0.94       6.8 +/-    0.94  0.080 / 0.280
G13     269.1          36.3                6.0 +/-    1.19       9.3 +/-    1.19  0.080 / 0.230
G15     297.1          16.6                3.6 +/-    1.43       8.6 +/-    1.43  0.040 / 0.030
G17     245.2          73.1                7.9 +/-    0.77       8.3 +/-    0.77  0.040 / 0.040
G19     228.8          47.7                6.3 +/-    0.44       8.2 +/-    0.44  0.050 / 0.120
G28     29.9           57.6                3.3 +/-    0.69       3.8 +/-    0.69  0.040 / 0.120
G30     139.8          53.2                7.7 +/-    0.96       9.4 +/-    0.96  0.040 / 0.080