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                5.1 +/-    1.94      10.0 +/-    1.94  0.090 / 0.160
G06     178.6          24.5                5.9 +/-    1.42      11.6 +/-    1.42  0.090 / 0.150
G07     146.1          10.3                4.5 +/-    2.25      12.6 +/-    2.25  0.050 / 0.050
G11     44.2           13.1                1.7 +/-    2.50       4.5 +/-    2.50  0.040 / 0.050
G13     252.5          30.1                8.7 +/-    1.48      15.1 +/-    1.48  0.170 / 0.320
G15     284.6          15.7                7.1 +/-    1.26      17.5 +/-    1.26  0.170 / 0.430
G17     329.4          78.4                5.8 +/-    0.36       5.9 +/-    0.36  0.020 / 0.020
G19     249.0          62.2                6.7 +/-    0.75       7.4 +/-    0.75  0.020 / 0.020
G28     53.6           52.4                4.3 +/-    1.15       5.3 +/-    1.15  0.060 / 0.110
G30     149.8          42.3                5.9 +/-    1.27       8.3 +/-    1.27  0.100 / 0.150