PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-19:27:50
G01     95.5           29.9               13.7 +/-    1.10      24.1 +/-    1.10  0.050 / 0.050
G07     121.9          43.5               14.1 +/-    0.86      19.5 +/-    0.86  0.030 / 0.050
G08     41.8           11.1               11.3 +/-    2.11      30.6 +/-    2.11  0.030 / 0.030
G11     73.2           41.4               13.1 +/-    1.27      18.7 +/-    1.27  0.030 / 0.030
G13     299.6          35.0               12.2 +/-    1.35      19.3 +/-    1.35  0.030 / 0.040
G17     210.0          48.9               15.7 +/-    0.54      20.0 +/-    0.54  0.050 / 0.050
G18     66.9           23.7               12.1 +/-    1.21      24.4 +/-    1.21  0.080 / 0.160
G19     211.8          22.7               13.8 +/-    2.17      28.5 +/-    2.17  0.080 / 0.150
G28     329.0          61.2               11.5 +/-    0.83      13.0 +/-    0.83  0.090 / 0.120
G30     88.5           77.7               13.2 +/-    0.41      13.5 +/-    0.41  0.070 / 0.110