PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-18:12:40
G01     119.9          16.6                9.4 +/-    1.33      22.5 +/-    1.33  0.030 / 0.050
G07     87.1           61.9                9.8 +/-    0.69      10.9 +/-    0.69  0.020 / 0.060
G08     45.4           32.4                7.5 +/-    0.62      12.6 +/-    0.62  0.090 / 0.240
G09     177.9          28.9               10.5 +/-    2.46      18.8 +/-    2.46  0.100 / 0.240
G11     107.2          40.0               10.8 +/-    0.38      15.8 +/-    0.38  0.040 / 0.080
G13     318.0          19.0                9.2 +/-    2.32      20.7 +/-    2.32  0.050 / 0.060
G17     200.6          23.2                9.8 +/-    2.14      20.1 +/-    2.14  0.040 / 0.110
G18     93.6           20.1                9.6 +/-    0.86      21.1 +/-    0.86  0.040 / 0.100
G28     283.4          53.6               10.6 +/-    0.64      12.8 +/-    0.64  0.130 / 0.350
G30     347.9          68.9                8.8 +/-    0.83       9.4 +/-    0.83  0.120 / 0.360