PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-03:57:30
G02     55.7           35.3                3.1 +/-    0.49       5.0 +/-    0.49  0.080 / 0.080
G05     66.6           64.2                4.9 +/-    0.67       5.4 +/-    0.67  0.080 / 0.090
G12     186.4          39.4                6.0 +/-    1.10       8.8 +/-    1.10  0.040 / 0.040
G13     133.1          11.1                1.7 +/-   15.92       4.8 +/-   15.92  0.030 / 0.050
G20     214.0          23.8                8.5 +/-    1.52      17.0 +/-    1.52  0.050 / 0.070
G21     266.6          13.7                7.3 +/-    2.28      18.6 +/-    2.28  0.050 / 0.110
G25     248.4          55.4                7.5 +/-    1.51       8.9 +/-    1.51  0.080 / 0.270
G29     324.3          48.7                5.5 +/-    1.61       7.0 +/-    1.61  0.090 / 0.260