PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-21:57:30
G02     49.5           42.3                9.2 +/-    0.88      12.9 +/-    0.88  0.040 / 0.060
G05     86.2           70.3               12.2 +/-    0.95      12.9 +/-    0.95  0.040 / 0.060
G12     186.2          42.0               12.6 +/-    0.97      17.7 +/-    0.97  0.060 / 0.050
G20     202.4          50.8              -57.3 +/-   61.66     -71.6 +/-   61.66  0.040 / 0.060
G21     263.3          11.2               -0.6 +/-   22.36      -1.8 +/-   22.36  0.030 / 0.040
G25     244.2          57.4               11.9 +/-    1.01      13.8 +/-    1.01  0.040 / 0.050
G29     323.0          47.2                8.6 +/-    1.33      11.3 +/-    1.33  0.160 / 0.280