PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/21-08:27:40
G03     205.4          51.6                7.4 +/-    0.85       9.1 +/-    0.85  0.180 / 0.300
G07     263.5          22.9                6.5 +/-    1.72      13.3 +/-    1.72  0.130 / 0.280
G09     313.1          32.9                3.8 +/-    1.28       6.3 +/-    1.28  0.060 / 0.120
G16     78.9           62.8                5.5 +/-    0.68       6.1 +/-    0.68  0.090 / 0.140
G22     187.3          35.1                5.2 +/-    1.10       8.3 +/-    1.10  0.100 / 0.100
G23     345.6          69.5                4.3 +/-    0.41       4.6 +/-    0.41  0.070 / 0.090
G26     49.2           37.9                3.9 +/-    0.98       5.9 +/-    0.98  0.040 / 0.040
G27     130.0          14.4                4.6 +/-    3.58      11.5 +/-    3.58  0.040 / 0.050