PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-22:57:50
G07     3.8            66.3               10.3 +/-    0.75      11.1 +/-    0.75  0.040 / 0.110
G08     72.4           51.9                9.9 +/-    0.49      12.3 +/-    0.49  0.050 / 0.120
G09     182.1          55.8               11.3 +/-    2.23      13.3 +/-    2.23  0.040 / 0.050
G11     136.5          23.5               12.8 +/-    0.99      25.9 +/-    0.99  0.040 / 0.050
G23     159.1          22.7               11.9 +/-    1.05      24.5 +/-    1.05  0.090 / 0.140
G27     42.2           19.9                7.9 +/-    0.49      17.5 +/-    0.49  0.080 / 0.140
G28     254.1          43.0               11.5 +/-    1.58      15.9 +/-    1.58  0.130 / 0.270
G30     320.1          50.7                9.3 +/-    0.97      11.6 +/-    0.97  0.130 / 0.330