PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/12-17:42:50
G02     45.3           45.6                7.8 +/-    0.72      10.4 +/-    0.72  0.020 / 0.030
G05     97.0           70.6                9.3 +/-    1.10       9.8 +/-    1.10  0.020 / 0.030
G12     184.6          45.0               11.0 +/-    1.93      14.9 +/-    1.93  0.030 / 0.050
G25     258.1          58.7               10.3 +/-    0.57      11.9 +/-    0.57  0.050 / 0.050
G29     319.0          41.3               11.2 +/-    1.10      16.0 +/-    1.10  0.040 / 0.060