PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-04:13:10
G01     239.9          28.8                5.0 +/-    1.67       9.0 +/-    1.67  0.040 / 0.040
G03     312.2          51.7                2.8 +/-    1.03       3.5 +/-    1.03  0.030 / 0.040
G14     72.1           33.0                2.7 +/-    0.80       4.4 +/-    0.80  0.100 / 0.170
G16     160.7          26.7                6.4 +/-    1.56      12.0 +/-    1.56  0.090 / 0.160
G22     282.6          73.6                4.9 +/-    0.63       5.1 +/-    0.63  0.090 / 0.130
G23     293.9          24.5                3.5 +/-    1.03       6.9 +/-    1.03  0.080 / 0.110
G26     129.8          45.5                7.2 +/-    0.60       9.6 +/-    0.60  0.030 / 0.040
G31     39.7           50.4                2.3 +/-    0.58       2.9 +/-    0.58  0.030 / 0.040
G32     85.1           18.8                3.5 +/-    0.78       7.9 +/-    0.78  0.060 / 0.190