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                9.3 +/-    1.13      16.0 +/-    1.13  0.080 / 0.190
G06     180.6          13.7               13.3 +/-    2.39      34.0 +/-    2.39  0.110 / 0.240
G07     141.3          20.8                9.5 +/-    2.41      20.5 +/-    2.41  0.060 / 0.140
G11     48.2           22.3                8.0 +/-    1.89      16.7 +/-    1.89  0.070 / 0.150
G13     266.8          35.3                9.3 +/-    1.55      14.6 +/-    1.55  0.050 / 0.110
G15     297.7          15.6                6.4 +/-    1.89      15.7 +/-    1.89  0.080 / 0.120
G17     260.7          77.9               11.9 +/-    0.38      12.1 +/-    0.38  0.040 / 0.040
G19     231.7          51.6               13.2 +/-    2.06      16.3 +/-    2.06  0.040 / 0.030
G28     33.8           56.9               10.3 +/-    1.41      12.1 +/-    1.41  0.020 / 0.030
G30     142.3          55.9               10.6 +/-    0.80      12.5 +/-    0.80  0.020 / 0.020