PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-14:27:40
G01     228.0          18.5                8.9 +/-    3.42      20.2 +/-    3.42  0.090 / 0.180
G03     287.2          68.8                5.8 +/-    0.80       6.1 +/-    0.80  0.080 / 0.170
G14     83.1           28.6                6.2 +/-    0.88      11.2 +/-    0.88  0.060 / 0.090
G16     147.1          43.7                9.9 +/-    0.61      13.6 +/-    0.61  0.070 / 0.110
G22     206.0          70.3                7.0 +/-    0.46       7.4 +/-    0.46  0.050 / 0.080
G23     308.4          39.6                6.2 +/-    0.72       9.1 +/-    0.72  0.060 / 0.080
G26     98.2           53.4                8.9 +/-    0.61      10.8 +/-    0.61  0.040 / 0.060
G31     45.0           32.2                5.1 +/-    1.22       8.5 +/-    1.22  0.030 / 0.050