PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-19:27:50
G01     105.7          25.7               11.2 +/-    0.46      21.5 +/-    0.46  0.030 / 0.030
G07     111.6          51.5               12.2 +/-    0.35      15.1 +/-    0.35  0.030 / 0.020
G08     41.6           18.9                8.5 +/-    0.86      19.1 +/-    0.86  0.030 / 0.050
G09     175.3          14.1               16.0 +/-    0.97      40.7 +/-    0.97  0.020 / 0.040
G11     85.8           42.9               11.8 +/-    0.65      16.4 +/-    0.65  0.070 / 0.070
G13     308.5          30.0               10.9 +/-    3.22      19.0 +/-    3.22  0.060 / 0.060
G17     205.3          39.4               14.7 +/-    1.68      21.6 +/-    1.68  0.070 / 0.140
G18     77.0           23.8                9.7 +/-    0.60      19.5 +/-    0.60  0.100 / 0.120
G28     310.8          59.4               12.3 +/-    1.03      14.1 +/-    1.03  0.060 / 0.180
G30     36.0           78.8               11.6 +/-    0.58      11.8 +/-    0.58  0.060 / 0.160