PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-14:27:50
G01     55.8           28.5                6.8 +/-    1.03      12.2 +/-    1.03  0.040 / 0.040
G06     179.3          18.8               12.0 +/-    2.05      27.1 +/-    2.05  0.040 / 0.050
G07     143.7          15.7               10.8 +/-    1.33      26.5 +/-    1.33  0.060 / 0.160
G11     45.9           17.9                6.3 +/-    0.70      14.6 +/-    0.70  0.120 / 0.160
G13     260.1          33.3                8.8 +/-    1.43      14.4 +/-    1.43  0.080 / 0.170
G15     292.3          15.8                4.8 +/-    3.58      11.6 +/-    3.58  0.070 / 0.170
G17     291.5          79.9               10.3 +/-    0.54      10.4 +/-    0.54  0.030 / 0.030
G19     238.4          56.6                9.8 +/-    1.14      11.5 +/-    1.14  0.030 / 0.030
G28     42.9           55.1                7.6 +/-    0.55       9.1 +/-    0.55  0.040 / 0.100
G30     146.2          50.1               10.4 +/-    0.94      13.1 +/-    0.94  0.050 / 0.110