PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-13:27:50
G01     248.7          34.1                5.9 +/-    1.29       9.5 +/-    1.29  0.050 / 0.100
G03     315.2          48.8                3.3 +/-    1.07       4.2 +/-    1.07  0.050 / 0.090
G11     237.1          11.3                4.7 +/-    3.07      12.8 +/-    3.07  0.090 / 0.200
G14     59.8           42.5                5.3 +/-    0.75       7.4 +/-    0.75  0.090 / 0.180
G18     220.1          26.1                5.6 +/-    1.40      10.7 +/-    1.40  0.060 / 0.110
G22     295.3          73.3                6.8 +/-    1.06       7.0 +/-    1.06  0.060 / 0.130
G23     290.3          24.5                0.3 +/-    7.59       0.6 +/-    7.59  0.090 / 0.570
G26     131.8          40.5                6.9 +/-    0.87       9.9 +/-    0.87  0.140 / 0.540
G31     40.9           54.0                5.0 +/-    0.70       6.0 +/-    0.70  0.040 / 0.070
G32     80.0           20.1                5.1 +/-    1.44      11.2 +/-    1.44  0.050 / 0.060