PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-10:27:50
G01     80.9           33.2                3.0 +/-    0.91       5.0 +/-    0.91  0.060 / 0.060
G07     131.9          37.9                6.8 +/-    0.59      10.3 +/-    0.59  0.040 / 0.060
G11     59.4           35.1                4.5 +/-    1.11       7.1 +/-    1.11  0.080 / 0.090
G13     284.8          37.9                2.9 +/-    2.18       4.3 +/-    2.18  0.070 / 0.100
G17     221.3          63.1                6.8 +/-    1.08       7.5 +/-    1.08  0.030 / 0.030
G18     54.9           20.9                4.4 +/-    5.24       9.4 +/-    5.24  0.030 / 0.030
G19     218.7          29.9                6.0 +/-    1.59      10.5 +/-    1.59  0.070 / 0.110
G28     2.0            61.1                3.6 +/-    0.64       4.0 +/-    0.64  0.060 / 0.110
G30     123.0          71.6                5.4 +/-    0.59       5.7 +/-    0.59  0.330 / 0.330