PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/25-17:58:00
G02     52.1           39.3               15.4 +/-    2.03      22.7 +/-    2.03  0.060 / 0.040
G05     85.9           70.6               25.8 +/-    0.43      27.1 +/-    0.43  0.060 / 0.040
G12     187.7          42.8               15.5 +/-    0.74      21.6 +/-    0.74  0.050 / 0.070
G20     203.4          50.1               21.7 +/-    0.95      27.3 +/-    0.95  0.050 / 0.050
G21     264.4          13.0               14.9 +/-    7.23      38.9 +/-    7.23  0.220 / 0.340
G25     247.3          57.1               14.6 +/-    1.04      17.0 +/-    1.04  0.220 / 0.300
G29     325.3          50.1               20.4 +/-    1.04      25.6 +/-    1.04  0.040 / 0.060