PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-04:28:00
G07     331.2          57.2                4.2 +/-    0.76       4.9 +/-    0.76  0.110 / 0.160
G08     101.1          51.0               24.5 +/-    0.44      30.5 +/-    0.44  0.090 / 0.160
G09     194.9          75.9                5.2 +/-    0.45       5.3 +/-    0.45  0.040 / 0.040
G11     146.8          11.5                8.2 +/-    2.37      22.3 +/-    2.37  0.030 / 0.040
G16     45.5           13.7                1.9 +/-    1.79       4.8 +/-    1.79  0.040 / 0.040
G23     155.2          45.3                6.4 +/-    0.62       8.6 +/-    0.62  0.030 / 0.040
G27     56.2           31.9                4.6 +/-    1.32       7.7 +/-    1.32  0.110 / 0.390
G28     236.0          28.6                5.4 +/-    2.12       9.8 +/-    2.12  0.300 / 0.300
G30     300.6          34.2                2.7 +/-    2.17       4.4 +/-    2.17  0.030 / 0.020