PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/27-16:27:30
G02     40.6           49.3                6.6 +/-    0.60       8.4 +/-    0.60  0.050 / 0.040
G05     120.0          69.6                7.2 +/-    0.86       7.7 +/-    0.86  0.040 / 0.050
G12     186.9          52.5                8.9 +/-    0.76      11.0 +/-    0.76  0.040 / 0.050
G25     270.4          59.6                5.0 +/-    1.73       5.6 +/-    1.73  0.040 / 0.050
G29     315.1          36.6                6.7 +/-    0.86      10.3 +/-    0.86  0.020 / 0.030