PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/12-16:27:50
G02     261.4          79.1                9.5 +/-    0.75       9.7 +/-    0.75  0.090 / 0.290
G05     173.0          18.6               12.6 +/-    0.71      28.7 +/-    0.71  0.080 / 0.300
G06     39.9           53.0                8.6 +/-    0.46      10.5 +/-    0.46  0.040 / 0.050
G12     320.8          58.4                9.3 +/-    1.34      10.7 +/-    1.34  0.030 / 0.050
G17     77.8           16.3                8.7 +/-    1.09      20.9 +/-    1.09  0.100 / 0.260
G19     65.1           33.0                8.4 +/-    0.80      13.9 +/-    0.80  0.090 / 0.230
G24     240.7          31.4               12.4 +/-    1.13      21.1 +/-    1.13  0.060 / 0.220
G25     317.7          21.0                7.6 +/-    2.88      16.4 +/-    2.88  0.060 / 0.230