PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-06:27:40
G10     257.3          31.6                8.9 +/-    2.00      15.0 +/-    2.00  0.100 / 0.220
G13     47.7           25.6                6.1 +/-    1.91      11.7 +/-    1.91  0.090 / 0.230
G15     71.7           54.4                6.3 +/-    0.72       7.6 +/-    0.72  0.530 / 0.400
G16     287.9          14.6                4.3 +/-    1.50      10.8 +/-    1.50  0.430 / 0.300
G20     354.6          69.6                6.3 +/-    0.40       6.7 +/-    0.40  0.040 / 0.040
G21     344.0          65.4                6.1 +/-    0.60       6.7 +/-    0.60  0.030 / 0.050
G26     259.8          12.4                7.0 +/-    2.04      18.6 +/-    2.04  0.040 / 0.030
G27     321.8          11.6               -3.8 +/-   21.14     -10.2 +/-   21.14  0.030 / 0.040
G29     166.7          41.8                6.3 +/-    0.74       8.8 +/-    0.74  0.180 / 0.160