PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-01:57:50
G02     57.6           34.0                7.8 +/-    1.91      12.6 +/-    1.91  0.080 / 0.070
G05     61.4           62.2                8.1 +/-    0.52       9.0 +/-    0.52  0.100 / 0.070
G12     185.0          35.3               11.4 +/-    1.17      18.0 +/-    1.17  0.030 / 0.030
G13     130.6          13.2               10.0 +/-    1.90      26.0 +/-    1.90  0.030 / 0.030
G20     217.6          10.6               -5.8 +/-   11.89     -16.0 +/-   11.89  0.090 / 0.320
G21     268.8          15.1                9.2 +/-    1.28      22.8 +/-    1.28  0.110 / 0.250
G25     242.6          53.8                9.1 +/-    3.20      11.0 +/-    3.20  0.240 / 0.270
G29     325.8          51.0                9.3 +/-    1.79      11.6 +/-    1.79  0.190 / 0.260