PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/18-21:28:00
G10     281.9          46.0               10.7 +/-    1.14      14.2 +/-    1.14  0.070 / 0.130
G15     51.5           43.4                8.9 +/-    0.58      12.3 +/-    0.58  0.060 / 0.140
G20     324.7          64.5                8.8 +/-    0.49       9.6 +/-    0.49  0.040 / 0.040
G21     47.9           77.1               10.0 +/-    0.58      10.2 +/-    0.58  0.030 / 0.040
G24     106.6          21.3               12.4 +/-    0.78      26.4 +/-    0.78  0.090 / 0.150
G27     311.7          27.1                8.3 +/-    0.64      15.4 +/-    0.64  0.090 / 0.180
G29     168.7          18.8               12.3 +/-    1.30      27.9 +/-    1.30  0.030 / 0.050
G32     206.4          21.9               11.5 +/-    0.79      24.1 +/-    0.79  0.030 / 0.060