PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-09:27:40
G01     84.7           32.7                6.8 +/-    0.61      11.2 +/-    0.61  0.040 / 0.060
G07     129.4          40.0                7.7 +/-    1.06      11.2 +/-    1.06  0.040 / 0.060
G11     63.3           36.5                4.7 +/-    0.48       7.3 +/-    0.48  0.050 / 0.100
G13     291.2          36.1                6.9 +/-    1.38      10.7 +/-    1.38  0.050 / 0.120
G15     312.6          11.7                2.4 +/-    2.42       6.5 +/-    2.42  0.090 / 0.210
G17     218.2          60.3                9.1 +/-    0.97      10.3 +/-    0.97  0.130 / 0.220
G19     216.7          32.8                7.4 +/-    4.44      12.2 +/-    4.44  0.050 / 0.050
G28     359.1          61.2                5.8 +/-    0.62       6.5 +/-    0.62  0.040 / 0.050
G30     115.2          73.0                6.5 +/-    0.70       6.8 +/-    0.70  0.070 / 0.090