PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-06:28:10
G10     246.5          22.9                5.1 +/-    2.16      10.4 +/-    2.16  0.040 / 0.040
G13     58.7           32.7                3.7 +/-    1.21       6.2 +/-    1.21  0.040 / 0.040
G15     95.3           57.4                5.6 +/-    0.70       6.5 +/-    0.70  0.110 / 0.300
G16     300.2          15.4                0.9 +/-    3.16       2.1 +/-    3.16  0.120 / 0.300
G20     329.4          73.4                4.7 +/-    0.66       4.9 +/-    0.66  0.030 / 0.050
G21     328.1          56.9                3.9 +/-    0.49       4.5 +/-    0.49  0.040 / 0.040
G26     271.4          17.5                3.7 +/-    1.23       8.6 +/-    1.23  0.030 / 0.030
G29     163.4          55.6                4.5 +/-    0.33       5.4 +/-    0.33  0.030 / 0.040