PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-21:28:10
G01     43.4           19.5               11.7 +/-    2.65      26.1 +/-    2.65  0.400 / 0.300
G06     177.7          31.5               17.4 +/-    1.60      29.5 +/-    1.60  0.290 / 0.340
G13     240.9          25.6               14.0 +/-    1.74      26.9 +/-    1.74  0.040 / 0.050
G15     274.4          13.8               10.6 +/-    1.40      27.1 +/-    1.40  0.040 / 0.050
G17     352.7          73.8               14.0 +/-    0.58      14.6 +/-    0.58  0.060 / 0.100
G19     263.8          66.7               15.0 +/-    1.23      16.1 +/-    1.23  0.060 / 0.110
G24     317.4          16.2               10.5 +/-    2.78      25.4 +/-    2.78  0.170 / 0.210
G28     60.0           52.2               13.2 +/-    0.83      16.2 +/-    0.83  0.110 / 0.160
G30     152.7          30.9               15.1 +/-    1.12      26.0 +/-    1.12  0.050 / 0.040