PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/27-17:42:40
G02     49.6           41.3               18.0 +/-    0.66      25.6 +/-    0.66  0.030 / 0.060
G05     96.0           71.2               19.8 +/-    0.56      20.8 +/-    0.56  0.030 / 0.070
G12     188.5          46.2               22.2 +/-    1.95      29.4 +/-    1.95  0.130 / 0.510
G20     202.4          46.8               26.0 +/-    1.16      34.1 +/-    1.16  0.110 / 0.520
G21     262.1          11.2                9.6 +/-   25.31      26.1 +/-   25.31  0.050 / 0.050
G25     253.5          58.3               19.7 +/-    0.70      22.7 +/-    0.70  0.040 / 0.040
G29     323.3          47.6               14.1 +/-    1.36      18.3 +/-    1.36  0.030 / 0.030