PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-19:12:50
G07     17.0           68.4               14.0 +/-    0.47      14.9 +/-    0.47  0.040 / 0.020
G08     65.9           50.7               13.2 +/-    1.02      16.5 +/-    1.02  0.050 / 0.020
G09     180.4          49.2               15.2 +/-    1.11      19.4 +/-    1.11  0.220 / 0.430
G11     131.1          27.6               14.0 +/-    1.90      25.9 +/-    1.90  0.170 / 0.320
G18     114.4          10.6               11.1 +/-   16.27      30.6 +/-   16.27  0.270 / 0.340
G23     158.7          14.7               15.1 +/-    2.93      37.8 +/-    2.93  0.210 / 0.390
G27     39.9           15.9                9.9 +/-    1.79      24.2 +/-    1.79  0.040 / 0.020
G28     260.6          46.5               15.0 +/-    3.41      19.7 +/-    3.41  0.040 / 0.020
G30     323.1          52.9               12.9 +/-    0.49      15.8 +/-    0.49  0.040 / 0.020