PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-21:58:20
G02     199.5          16.6               18.8 +/-    0.89      45.1 +/-    0.89  0.050 / 0.070
G06     175.0          46.1               16.6 +/-    1.73      22.0 +/-    1.73  0.040 / 0.070
G13     229.8          16.5               17.1 +/-    3.46      40.9 +/-    3.46  0.090 / 0.210
G17     17.2           63.1               12.8 +/-    0.69      14.2 +/-    0.69  0.080 / 0.160
G19     306.2          71.6               12.9 +/-    0.42      13.6 +/-    0.42  0.110 / 0.240
G24     312.1          27.0               10.7 +/-    2.48      20.0 +/-    2.48  0.090 / 0.230
G28     78.7           45.8               12.8 +/-    0.63      17.0 +/-    0.63  0.050 / 0.070
G30     156.0          17.7               18.8 +/-    2.93      43.7 +/-    2.93  0.060 / 0.080