PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-21:27:20
G02     42.8           47.8                8.9 +/-    0.67      11.5 +/-    0.67  0.040 / 0.060
G05     114.0          70.4               10.2 +/-    1.04      10.7 +/-    1.04  0.040 / 0.050
G12     188.5          50.9               11.1 +/-    1.09      13.8 +/-    1.09  0.050 / 0.070
G20     200.1          42.2               11.5 +/-    1.72      16.2 +/-    1.72  0.060 / 0.060
G25     260.5          60.3               11.4 +/-    1.52      12.9 +/-    1.52  0.060 / 0.090
G29     317.8          40.6               10.8 +/-    1.31      15.5 +/-    1.31  0.060 / 0.070