PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/10/28-08:27:50
G01     67.8           32.5                4.0 +/-    1.09       6.7 +/-    1.09  0.040 / 0.040
G07     138.7          27.4                4.8 +/-    1.79       9.0 +/-    1.79  0.040 / 0.040
G11     51.0           27.7                1.8 +/-    1.31       3.4 +/-    1.31  0.050 / 0.110
G13     270.8          37.5                6.1 +/-    1.06       9.2 +/-    1.06  0.050 / 0.110
G15     303.3          14.1                1.1 +/-    1.89       2.8 +/-    1.89  0.070 / 0.090
G17     240.2          73.8                5.6 +/-    0.53       5.8 +/-    0.53  0.060 / 0.070
G18     45.5           15.4                2.3 +/-    1.88       5.6 +/-    1.88  0.070 / 0.110
G19     225.7          40.8                6.6 +/-    0.78       9.5 +/-    0.78  0.060 / 0.120
G28     21.3           59.3                4.5 +/-    0.35       5.1 +/-    0.35  0.160 / 0.470
G30     138.3          61.2                7.4 +/-    0.42       8.4 +/-    0.42  0.120 / 0.410