PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/19-16:57:40
G07     329.7          57.5               12.8 +/-    0.74      14.9 +/-    0.74  0.040 / 0.060
G08     111.6          48.3               13.7 +/-    0.55      17.6 +/-    0.55  0.040 / 0.080
G09     229.0          81.9               13.6 +/-    1.19      13.7 +/-    1.19  0.040 / 0.060
G16     44.0           17.1               10.3 +/-    0.65      24.3 +/-    0.65  0.030 / 0.050
G23     152.1          51.0               14.4 +/-    1.22      18.0 +/-    1.22  0.080 / 0.120
G27     66.1           36.3               12.8 +/-    0.77      19.8 +/-    0.77  0.080 / 0.130
G28     230.1          18.4               12.6 +/-    3.10      28.9 +/-    3.10  0.030 / 0.030
G30     295.9          31.0               13.4 +/-    2.43      22.9 +/-    2.43  0.030 / 0.040