PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-12:42:40
G01     106.3          25.7                6.2 +/-    1.40      11.9 +/-    1.40  0.210 / 0.450
G07     109.0          55.0                5.8 +/-    0.51       6.9 +/-    0.51  0.160 / 0.440
G08     41.7           18.1                5.0 +/-    1.24      11.4 +/-    1.24  0.100 / 0.150
G09     172.9          10.9                5.4 +/-    3.27      14.7 +/-    3.27  0.060 / 0.170
G11     85.9           40.8                6.4 +/-    1.10       9.2 +/-    1.10  0.030 / 0.030
G13     310.8          27.1                2.4 +/-    1.90       4.5 +/-    1.90  0.020 / 0.030
G17     205.4          40.9                5.5 +/-    0.86       7.9 +/-    0.86  0.080 / 0.150
G19     208.9          15.0                4.3 +/-    4.06      10.8 +/-    4.06  0.070 / 0.140
G28     319.4          60.9                1.9 +/-    0.65       2.2 +/-    0.65  0.050 / 0.060
G30     16.1           77.3                3.4 +/-    0.42       3.5 +/-    0.42  0.030 / 0.060