PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/20-14:13:00
G01     127.8          10.0              -10.8 +/-   34.69     -30.2 +/-   34.69  0.090 / 0.090
G07     59.0           67.5                8.8 +/-    0.67       9.4 +/-    0.67  0.120 / 0.110
G08     53.2           42.6                7.2 +/-    0.83      10.1 +/-    0.83  0.060 / 0.110
G09     179.1          39.7                8.5 +/-    0.74      12.4 +/-    0.74  0.080 / 0.100
G11     120.1          34.9                8.9 +/-    1.01      14.1 +/-    1.01  0.040 / 0.030
G17     199.8          11.2               -2.9 +/-   19.97      -7.8 +/-   19.97  0.030 / 0.030
G18     104.4          15.6                8.7 +/-    1.83      21.4 +/-    1.83  0.120 / 0.280
G27     37.6           9.8                 7.3 +/-    3.08      20.5 +/-    3.08  0.110 / 0.220
G28     267.3          47.2                8.3 +/-    3.49      10.8 +/-    3.49  0.150 / 0.260
G30     333.9          61.2                7.9 +/-    0.84       8.9 +/-    0.84  0.130 / 0.360