PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-17:42:30
G07     28.5           67.8               11.4 +/-    0.62      12.2 +/-    0.62  0.030 / 0.030
G08     65.4           48.6               11.2 +/-    0.97      14.4 +/-    0.97  0.030 / 0.030
G09     181.3          53.4               14.6 +/-    0.51      17.7 +/-    0.51  0.050 / 0.050
G11     130.7          27.0               11.7 +/-    2.72      21.7 +/-    2.72  0.060 / 0.060
G23     159.9          21.6               11.6 +/-    1.77      24.6 +/-    1.77  0.070 / 0.100
G27     42.1           20.2               10.1 +/-    2.43      22.1 +/-    2.43  0.070 / 0.150
G28     253.3          40.0               14.2 +/-    2.09      20.7 +/-    2.09  0.220 / 0.210
G30     319.7          50.6               10.7 +/-    0.69      13.4 +/-    0.69  0.190 / 0.150