PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/30-20:57:40
G10     261.7          34.1               14.4 +/-    1.35      23.3 +/-    1.35  0.170 / 0.090
G13     45.3           23.6               12.0 +/-    2.72      24.2 +/-    2.72  0.100 / 0.110
G15     65.3           52.2               14.2 +/-    0.76      17.5 +/-    0.76  0.040 / 0.030
G16     287.9          12.5               13.4 +/-    1.51      35.5 +/-    1.51  0.040 / 0.040
G18     290.8          62.7               13.2 +/-    0.65      14.7 +/-    0.65  0.260 / 0.360
G20     51.1           38.6               13.3 +/-    2.02      19.8 +/-    2.02  0.260 / 0.270
G21     356.3          69.7               15.2 +/-    0.57      16.1 +/-    0.57  0.190 / 0.220
G24     125.6          10.9               -3.6 +/-   46.06      -9.9 +/-   46.06  0.130 / 0.200
G27     319.9          16.3               12.2 +/-    2.45      29.3 +/-    2.45  0.040 / 0.070
G29     165.4          32.0               16.0 +/-    1.23      26.9 +/-    1.23  0.070 / 0.070