PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/13-13:12:40
G01     48.4           23.9                3.3 +/-    0.91       6.6 +/-    0.91  0.110 / 0.280
G06     178.0          26.6                6.2 +/-    1.39      11.7 +/-    1.39  0.090 / 0.280
G11     43.8           11.3                4.0 +/-    1.62      10.8 +/-    1.62  0.050 / 0.120
G13     250.7          29.1                7.5 +/-    2.18      13.3 +/-    2.18  0.060 / 0.120
G15     283.2          15.3                5.6 +/-    1.79      13.9 +/-    1.79  0.090 / 0.140
G17     338.0          77.4                6.0 +/-    0.77       6.1 +/-    0.77  0.080 / 0.110
G19     252.5          63.7                5.0 +/-    0.42       5.5 +/-    0.42  0.040 / 0.060
G28     56.3           51.7                4.4 +/-    0.72       5.4 +/-    0.72  0.060 / 0.060
G30     150.7          40.6                6.9 +/-    1.27       9.9 +/-    1.27  0.030 / 0.030