PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-12:27:50
G01     49.8           25.1                3.1 +/-    1.10       6.1 +/-    1.10  0.040 / 0.060
G06     178.6          24.5                5.2 +/-    1.18      10.2 +/-    1.18  0.050 / 0.060
G07     146.1          10.3                3.3 +/-    2.86       9.1 +/-    2.86  0.110 / 0.330
G11     44.2           13.1                1.4 +/-    1.50       3.7 +/-    1.50  0.120 / 0.280
G13     252.5          30.1                7.7 +/-    1.65      13.4 +/-    1.65  0.130 / 0.320
G15     284.6          15.7                5.7 +/-    2.91      13.9 +/-    2.91  0.080 / 0.290
G17     329.4          78.4                4.3 +/-    0.46       4.3 +/-    0.46  0.030 / 0.030
G19     249.0          62.2                5.7 +/-    1.03       6.4 +/-    1.03  0.050 / 0.030
G28     53.6           52.4                3.1 +/-    0.32       3.8 +/-    0.32  0.050 / 0.100
G30     149.8          42.3                5.6 +/-    1.23       7.8 +/-    1.23  0.050 / 0.110