PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-05:57:30
G01     65.3           32.0                2.9 +/-    0.36       5.0 +/-    0.36  0.030 / 0.060
G07     140.0          26.2                7.5 +/-    0.81      14.2 +/-    0.81  0.050 / 0.060
G11     51.2           27.6                1.0 +/-    0.47       1.9 +/-    0.47  0.040 / 0.120
G13     269.9          36.3                6.2 +/-    1.77       9.7 +/-    1.77  0.040 / 0.110
G15     297.7          16.5                2.9 +/-    2.78       7.0 +/-    2.78  0.030 / 0.030
G17     245.4          73.9                5.5 +/-    0.62       5.7 +/-    0.62  0.030 / 0.040
G19     228.4          47.7                5.8 +/-    1.28       7.5 +/-    1.28  0.080 / 0.190
G28     29.1           57.7                2.6 +/-    0.60       3.0 +/-    0.60  0.080 / 0.190
G30     139.5          55.2                6.5 +/-    0.56       7.7 +/-    0.56  0.040 / 0.090