PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-15:12:30
G03     218.4          63.2                9.5 +/-    0.80      10.5 +/-    0.80  0.040 / 0.040
G09     306.6          22.1                7.7 +/-    3.10      16.2 +/-    3.10  0.040 / 0.040
G14     103.5          13.6                7.6 +/-    1.33      19.5 +/-    1.33  0.110 / 0.350
G16     110.8          62.7                8.0 +/-    0.44       8.9 +/-    0.44  0.120 / 0.270
G22     186.2          45.3                8.9 +/-    0.82      11.9 +/-    0.82  0.040 / 0.050
G23     328.8          57.9                7.8 +/-    0.35       9.0 +/-    0.35  0.040 / 0.050
G26     59.2           46.7                7.0 +/-    0.92       9.2 +/-    0.92  0.050 / 0.030
G31     56.0           13.4                4.9 +/-    1.78      12.6 +/-    1.78  0.040 / 0.040