PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-08:58:10
G01     127.4          11.3               -3.4 +/-   30.66      -9.2 +/-   30.66  0.040 / 0.040
G07     53.6           69.3                5.8 +/-    1.85       6.1 +/-    1.85  0.040 / 0.070
G08     49.7           38.1                4.3 +/-    0.98       6.4 +/-    0.98  0.030 / 0.050
G09     174.4          31.9                6.0 +/-    1.97      10.0 +/-    1.97  0.030 / 0.040
G11     117.2          35.3                6.3 +/-    1.24       9.9 +/-    1.24  0.140 / 0.370
G13     321.1          11.6               -6.3 +/-   14.93     -16.9 +/-   14.93  0.130 / 0.360
G17     199.2          15.9                2.5 +/-    3.42       6.2 +/-    3.42  0.110 / 0.280
G18     102.7          16.4                6.0 +/-    1.54      14.5 +/-    1.54  0.130 / 0.360
G28     274.5          52.0                4.9 +/-    0.98       6.1 +/-    0.98  0.120 / 0.430
G30     330.3          58.9                2.4 +/-    2.04       2.7 +/-    2.04  0.130 / 0.450