PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-05:57:30
G03     212.1          54.6                7.1 +/-    0.78       8.5 +/-    0.78  0.030 / 0.040
G07     261.5          19.9                5.8 +/-    2.32      12.9 +/-    2.32  0.030 / 0.040
G09     313.5          34.2                2.6 +/-    0.70       4.2 +/-    0.70  0.070 / 0.060
G16     90.1           66.3                7.4 +/-    0.47       8.1 +/-    0.47  0.050 / 0.070
G22     187.3          37.7                5.5 +/-    0.96       8.3 +/-    0.96  0.130 / 0.230
G23     332.5          62.4                4.5 +/-    0.42       5.0 +/-    0.42  0.130 / 0.240
G26     51.8           43.2                6.1 +/-    1.36       8.5 +/-    1.36  0.040 / 0.030
G27     129.2          14.3                5.3 +/-    1.96      13.5 +/-    1.96  0.040 / 0.030
G31     61.3           9.5                 2.3 +/-    5.26       6.4 +/-    5.26  0.170 / 0.220