PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/30-21:58:00
G02     51.7           39.0                7.7 +/-    1.30      11.4 +/-    1.30  0.060 / 0.060
G05     74.9           67.0                9.6 +/-    0.48      10.3 +/-    0.48  0.060 / 0.040
G12     187.7          44.2               10.1 +/-    0.85      13.7 +/-    0.85  0.090 / 0.080
G21     264.3          11.2                0.6 +/-   22.26       1.5 +/-   22.26  0.070 / 0.090
G25     253.6          56.9                8.4 +/-    1.25       9.8 +/-    1.25  0.220 / 0.320
G29     323.6          47.4                9.5 +/-    0.86      12.4 +/-    0.86  0.170 / 0.370