PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/16-20:27:40
G02     45.7           45.3               13.3 +/-    0.67      17.9 +/-    0.67  0.050 / 0.060
G05     108.9          71.2               15.7 +/-    0.91      16.5 +/-    0.91  0.040 / 0.060
G12     188.3          48.6               14.6 +/-    0.59      18.8 +/-    0.59  0.040 / 0.050
G20     200.9          44.5               15.5 +/-    1.28      21.0 +/-    1.28  0.040 / 0.050
G25     256.1          59.6               14.1 +/-    1.39      16.0 +/-    1.39  0.070 / 0.050
G29     319.9          43.2               13.3 +/-    1.17      18.4 +/-    1.17  0.060 / 0.050