PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-03:12:30
G02     61.3           30.6                4.8 +/-    0.92       8.3 +/-    0.92  0.090 / 0.270
G05     54.9           58.4                7.6 +/-    0.70       8.8 +/-    0.70  0.090 / 0.280
G12     185.9          33.2                9.6 +/-    1.57      15.8 +/-    1.57  0.060 / 0.060
G13     125.8          16.1                7.8 +/-    2.15      19.0 +/-    2.15  0.070 / 0.070
G15     161.9          14.3                6.8 +/-    1.50      17.1 +/-    1.50  0.090 / 0.110
G21     273.6          19.7                8.9 +/-    1.51      19.8 +/-    1.51  0.060 / 0.090
G25     232.8          50.7               10.5 +/-    2.89      13.2 +/-    2.89  0.030 / 0.030
G29     334.3          60.2                8.5 +/-    0.82       9.7 +/-    0.82  0.030 / 0.030