PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/01-21:27:50
G01     110.0          24.0               15.0 +/-    1.90      30.0 +/-    1.90  0.060 / 0.130
G07     101.6          60.9               14.4 +/-    1.00      16.2 +/-    1.00  0.110 / 0.130
G08     43.0           27.0               10.2 +/-    1.88      19.1 +/-    1.88  0.100 / 0.150
G09     176.0          17.1               17.4 +/-    1.69      41.1 +/-    1.69  0.080 / 0.130
G11     96.1           43.0               15.1 +/-    0.58      20.9 +/-    0.58  0.030 / 0.030
G13     312.1          26.3               12.3 +/-    1.68      23.4 +/-    1.68  0.030 / 0.030
G17     205.8          31.2               16.0 +/-    1.01      27.4 +/-    1.01  0.100 / 0.150
G18     84.2           23.8               13.0 +/-    1.70      26.1 +/-    1.70  0.080 / 0.150
G28     313.0          60.6               11.8 +/-    0.93      13.3 +/-    0.93  0.040 / 0.040
G30     23.2           77.0               13.8 +/-    0.74      14.1 +/-    0.74  0.040 / 0.040