PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-13:27:50
G01     89.7           31.7                7.5 +/-    0.48      12.7 +/-    0.48  0.040 / 0.070
G07     125.9          42.4                7.9 +/-    0.98      11.1 +/-    0.98  0.030 / 0.060
G11     66.9           37.3                5.3 +/-    1.02       8.1 +/-    1.02  0.050 / 0.140
G13     296.5          34.7                5.8 +/-    0.81       9.2 +/-    0.81  0.050 / 0.120
G17     214.2          56.4                6.8 +/-    1.04       8.0 +/-    1.04  0.030 / 0.040
G19     214.5          29.0                7.5 +/-    0.97      13.4 +/-    0.97  0.030 / 0.030
G28     349.8          61.6                4.7 +/-    0.43       5.3 +/-    0.43  0.060 / 0.110
G30     97.7           77.7                6.0 +/-    0.52       6.1 +/-    0.52  0.070 / 0.100