PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-21:57:30
G07     28.8           68.3               12.5 +/-    0.70      13.3 +/-    0.70  0.030 / 0.040
G08     60.9           46.2               13.0 +/-    0.72      17.2 +/-    0.72  0.030 / 0.030
G09     179.7          49.7               15.8 +/-    0.91      20.0 +/-    0.91  0.050 / 0.050
G11     128.2          28.5               16.2 +/-    1.33      29.3 +/-    1.33  0.050 / 0.040
G18     110.8          10.5                9.4 +/-   24.26      26.0 +/-   24.26  0.120 / 0.140
G23     160.8          20.8               13.5 +/-    1.59      29.1 +/-    1.59  0.190 / 0.120
G27     41.4           19.1                9.7 +/-    1.54      21.9 +/-    1.54  0.130 / 0.090
G28     256.7          42.7               15.4 +/-    1.81      21.5 +/-    1.81  0.100 / 0.080
G30     320.2          50.8               11.9 +/-    0.83      14.8 +/-    0.83  0.050 / 0.060