PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-21:57:40
G07     320.9          52.9               10.0 +/-    0.49      12.2 +/-    0.49  0.150 / 0.320
G08     116.3          48.5               11.9 +/-    0.85      15.3 +/-    0.85  0.150 / 0.270
G09     227.7          81.7               11.2 +/-    0.65      11.3 +/-    0.65  0.040 / 0.050
G16     44.3           14.6                8.4 +/-    1.39      21.0 +/-    1.39  0.030 / 0.030
G23     151.5          49.2               11.8 +/-    0.45      15.0 +/-    0.45  0.220 / 0.270
G27     63.2           34.8               10.1 +/-    0.87      16.1 +/-    0.87  0.140 / 0.290
G28     231.4          23.3               12.6 +/-    2.94      25.6 +/-    2.94  0.060 / 0.070
G30     297.5          33.1                9.5 +/-    2.12      15.6 +/-    2.12  0.040 / 0.080