PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/19-17:57:50
G07     26.4           67.7               12.4 +/-    0.97      13.2 +/-    0.97  0.080 / 0.150
G08     66.2           48.8               12.6 +/-    0.51      16.2 +/-    0.51  0.090 / 0.200
G09     181.4          54.0               13.9 +/-    2.96      16.7 +/-    2.96  0.030 / 0.040
G11     131.1          26.6               14.0 +/-    1.28      26.3 +/-    1.28  0.030 / 0.050
G23     159.8          22.4               14.7 +/-    2.57      30.6 +/-    2.57  0.050 / 0.060
G27     42.5           20.7               10.5 +/-    1.22      22.7 +/-    1.22  0.050 / 0.080
G28     252.7          39.6               14.2 +/-    1.21      20.8 +/-    1.21  0.040 / 0.050
G30     319.0          50.0               12.6 +/-    0.87      16.0 +/-    0.87  0.050 / 0.050