PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-21:27:40
G10     258.7          32.0               16.7 +/-    1.91      28.1 +/-    1.91  0.060 / 0.090
G13     47.3           25.8               11.9 +/-    1.45      22.8 +/-    1.45  0.130 / 0.090
G15     70.2           54.2               15.2 +/-    0.87      18.3 +/-    0.87  0.230 / 0.350
G16     290.4          13.1               13.1 +/-    1.45      33.9 +/-    1.45  0.210 / 0.380
G18     284.6          61.1               15.6 +/-    1.29      17.6 +/-    1.29  0.110 / 0.320
G20     49.1           40.8               12.5 +/-    0.98      17.9 +/-    0.98  0.110 / 0.300
G21     349.4          67.5               15.9 +/-    0.97      17.0 +/-    0.97  0.100 / 0.260
G26     263.3          11.6               16.0 +/-    1.87      43.2 +/-    1.87  0.100 / 0.230
G27     320.9          13.8               11.6 +/-    1.17      29.7 +/-    1.17  0.060 / 0.070
G29     165.0          35.6               16.1 +/-    0.98      25.3 +/-    0.98  0.050 / 0.080