PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/21-09:57:40
G02     202.9          36.3                7.4 +/-    0.86      11.5 +/-    0.86  0.070 / 0.120
G06     168.3          67.0                8.9 +/-    0.75       9.6 +/-    0.75  0.060 / 0.120
G12     307.7          14.5                2.5 +/-    1.87       6.2 +/-    1.87  0.110 / 0.090
G17     38.1           47.5                5.8 +/-    1.77       7.5 +/-    1.77  0.100 / 0.110
G19     6.4            64.1                6.5 +/-    0.75       7.2 +/-    0.75  0.030 / 0.050
G24     298.8          37.4                4.0 +/-    3.11       6.1 +/-    3.11  0.050 / 0.040
G28     103.6          30.1                8.7 +/-    1.21      15.3 +/-    1.21  0.160 / 0.300