PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-13:28:00
G01     122.0          15.7                8.0 +/-    0.91      19.6 +/-    0.91  0.030 / 0.040
G07     71.3           68.0                6.6 +/-    0.84       7.0 +/-    0.84  0.040 / 0.040
G08     46.3           33.8                5.3 +/-    0.64       8.5 +/-    0.64  0.090 / 0.220
G09     176.2          28.0                9.5 +/-    1.51      17.3 +/-    1.51  0.110 / 0.200
G11     110.3          38.5                8.9 +/-    0.77      13.2 +/-    0.77  0.030 / 0.050
G13     319.1          16.9                5.1 +/-    1.64      12.1 +/-    1.64  0.020 / 0.040
G17     200.9          21.1                7.5 +/-    1.83      16.2 +/-    1.83  0.040 / 0.060
G18     97.4           19.4                7.7 +/-    1.27      17.2 +/-    1.27  0.040 / 0.060
G28     286.4          55.9                6.9 +/-    0.96       8.1 +/-    0.96  0.050 / 0.100
G30     339.6          65.1                6.2 +/-    0.48       6.8 +/-    0.48  0.040 / 0.080