PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-16:58:00
G02     45.8           45.1                9.7 +/-    1.44      13.0 +/-    1.44  0.040 / 0.050
G05     98.7           70.9               11.1 +/-    0.50      11.7 +/-    0.50  0.050 / 0.040
G12     185.1          45.5               13.7 +/-    0.61      18.3 +/-    0.61  0.020 / 0.030
G25     257.3          58.8               12.0 +/-    1.33      13.8 +/-    1.33  0.030 / 0.030
G29     319.1          41.5               11.5 +/-    0.98      16.3 +/-    0.98  0.050 / 0.060