PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-14:27:40
G01     61.5           30.8                9.1 +/-    1.12      15.6 +/-    1.12  0.050 / 0.040
G06     180.6          13.7               12.3 +/-    2.29      31.4 +/-    2.29  0.040 / 0.040
G07     141.3          20.8               10.0 +/-    0.96      21.6 +/-    0.96  0.080 / 0.130
G11     48.2           22.3                7.5 +/-    0.92      15.6 +/-    0.92  0.040 / 0.130
G13     266.8          35.3               10.1 +/-    1.16      16.0 +/-    1.16  0.060 / 0.140
G15     297.7          15.6                5.8 +/-    2.34      14.3 +/-    2.34  0.070 / 0.150
G17     260.7          77.9               11.3 +/-    0.46      11.5 +/-    0.46  0.050 / 0.080
G19     231.7          51.6               13.0 +/-    0.97      16.1 +/-    0.97  0.070 / 0.110
G28     33.8           56.9                9.7 +/-    0.65      11.4 +/-    0.65  0.020 / 0.030
G30     142.3          55.9               10.5 +/-    0.92      12.4 +/-    0.92  0.020 / 0.030