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               10.4 +/-    1.94      12.7 +/-    1.94  0.110 / 0.400
G08     116.3          48.5               13.3 +/-    0.76      17.1 +/-    0.76  0.100 / 0.290
G09     227.7          81.7               11.8 +/-    0.66      11.9 +/-    0.66  0.040 / 0.060
G16     44.3           14.6                7.2 +/-    1.23      18.0 +/-    1.23  0.030 / 0.060
G23     151.5          49.2               12.1 +/-    0.73      15.4 +/-    0.73  0.110 / 0.370
G27     63.2           34.8                9.4 +/-    0.84      15.0 +/-    0.84  0.110 / 0.350
G28     231.4          23.3               14.6 +/-    1.15      29.7 +/-    1.15  0.060 / 0.070
G30     297.5          33.1                9.6 +/-    1.72      15.8 +/-    1.72  0.050 / 0.060