PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-15:12:50
G01     68.2           32.6                8.1 +/-    0.93      13.4 +/-    0.93  0.040 / 0.040
G07     138.7          29.0                7.5 +/-    1.32      13.3 +/-    1.32  0.030 / 0.040
G11     51.8           28.6                6.2 +/-    1.41      11.1 +/-    1.41  0.060 / 0.150
G13     271.4          37.3                8.8 +/-    1.02      13.4 +/-    1.02  0.060 / 0.160
G15     302.9          14.4                5.1 +/-    1.57      12.9 +/-    1.57  0.050 / 0.080
G17     237.9          71.1                8.7 +/-    0.62       9.2 +/-    0.62  0.050 / 0.090
G18     47.1           16.9                5.5 +/-    0.74      13.1 +/-    0.74  0.040 / 0.050
G19     225.7          41.0               11.6 +/-    0.46      16.6 +/-    0.46  0.040 / 0.060
G28     23.2           58.8                8.6 +/-    0.43       9.9 +/-    0.43  0.050 / 0.100
G30     137.9          60.7                8.8 +/-    0.84      10.0 +/-    0.84  0.050 / 0.120