PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-21:28:00
G10     257.0          30.8               16.8 +/-    2.28      28.9 +/-    2.28  0.030 / 0.040
G13     48.7           27.0               14.2 +/-    1.83      26.5 +/-    1.83  0.030 / 0.040
G15     73.2           55.1               17.1 +/-    0.63      20.4 +/-    0.63  0.180 / 0.440
G16     292.2          13.4               12.5 +/-    1.91      32.3 +/-    1.91  0.170 / 0.510
G18     281.2          60.2               17.1 +/-    0.82      19.3 +/-    0.82  0.110 / 0.360
G20     47.8           42.3               15.2 +/-    0.65      21.3 +/-    0.65  0.120 / 0.340
G21     346.2          66.2               15.0 +/-    0.69      16.2 +/-    0.69  0.050 / 0.080
G26     264.9          12.4               14.8 +/-    2.02      39.2 +/-    2.02  0.060 / 0.080
G27     321.4          12.3               11.5 +/-    2.41      30.5 +/-    2.41  0.160 / 0.240
G29     164.7          37.7               19.1 +/-    0.98      28.9 +/-    0.98  0.150 / 0.210