PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-07:27:50
G10     285.2          47.1                6.1 +/-    1.18       8.0 +/-    1.18  0.100 / 0.050
G15     48.2           35.3                2.8 +/-    0.76       4.3 +/-    0.76  0.080 / 0.040
G20     41.0           54.1                5.5 +/-    0.90       6.6 +/-    0.90  0.040 / 0.070
G21     61.0           77.2                6.8 +/-    1.01       7.0 +/-    1.01  0.040 / 0.060
G24     106.5          22.7                7.6 +/-    0.58      15.7 +/-    0.58  0.060 / 0.030
G27     308.3          30.2                6.1 +/-    1.75      10.6 +/-    1.75  0.050 / 0.020
G29     168.7          15.7                6.8 +/-    0.78      16.6 +/-    0.78  0.100 / 0.080
G32     207.2          25.1                3.4 +/-    1.78       6.6 +/-    1.78  0.130 / 0.070