PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-03:12:50
G02     61.3           30.6                5.4 +/-    0.87       9.4 +/-    0.87  0.040 / 0.060
G05     54.9           58.4                7.2 +/-    0.49       8.3 +/-    0.49  0.040 / 0.060
G12     185.9          33.2                9.3 +/-    1.10      15.3 +/-    1.10  0.110 / 0.240
G13     125.8          16.1                8.6 +/-    1.74      20.8 +/-    1.74  0.090 / 0.300
G15     161.9          14.3                6.9 +/-    3.02      17.5 +/-    3.02  0.100 / 0.100
G21     273.6          19.7                7.5 +/-    1.46      16.5 +/-    1.46  0.060 / 0.110
G25     232.8          50.7                8.2 +/-    1.07      10.2 +/-    1.07  0.030 / 0.030
G29     334.3          60.2                8.2 +/-    0.58       9.2 +/-    0.58  0.030 / 0.030