PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/27-20:12:40
G02     53.1           38.2                6.8 +/-    1.21      10.2 +/-    1.21  0.050 / 0.060
G05     70.2           66.2                7.0 +/-    0.36       7.5 +/-    0.36  0.040 / 0.060
G12     186.4          41.0                8.8 +/-    0.65      12.6 +/-    0.65  0.270 / 0.560
G13     131.9          10.5                3.4 +/-   23.58       9.2 +/-   23.58  0.290 / 0.470
G21     266.1          12.4                6.0 +/-   11.77      15.8 +/-   11.77  0.190 / 0.370
G25     249.4          55.9                7.9 +/-    2.66       9.3 +/-    2.66  0.140 / 0.460
G29     324.6          48.8                6.8 +/-    0.43       8.7 +/-    0.43  0.060 / 0.070