PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-18:27:40
G02     55.4           36.5               11.5 +/-    1.19      17.7 +/-    1.19  0.070 / 0.070
G05     73.8           68.9               11.5 +/-    0.44      12.2 +/-    0.44  0.070 / 0.080
G12     186.5          38.1               12.3 +/-    0.64      18.5 +/-    0.64  0.250 / 0.380
G13     133.6          11.7               18.4 +/-    3.30      49.5 +/-    3.30  0.170 / 0.360
G20     205.0          54.9               14.5 +/-    0.61      17.3 +/-    0.61  0.040 / 0.070
G21     267.6          15.5               10.0 +/-    3.05      24.6 +/-    3.05  0.040 / 0.060
G25     239.3          54.7               12.5 +/-    2.15      15.0 +/-    2.15  0.190 / 0.440
G29     328.2          53.8               10.8 +/-    1.18      13.1 +/-    1.18  0.280 / 0.440