PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/17-20:57:30
G07     320.3          53.8               10.4 +/-    0.91      12.6 +/-    0.91  0.030 / 0.030
G08     115.7          46.0               12.6 +/-    0.66      16.8 +/-    0.66  0.040 / 0.030
G09     256.9          83.2               12.0 +/-    1.31      12.1 +/-    1.31  0.360 / 0.630
G16     43.0           21.3                8.4 +/-    2.19      18.0 +/-    2.19  0.140 / 0.460
G23     150.3          57.5               12.4 +/-    0.64      14.4 +/-    0.64  0.040 / 0.040
G27     72.5           37.7               11.6 +/-    1.18      17.5 +/-    1.18  0.050 / 0.040
G28     227.6          15.8               11.5 +/-    9.20      28.2 +/-    9.20  0.060 / 0.060
G30     291.5          26.5                9.4 +/-    1.79      17.8 +/-    1.79  0.040 / 0.060