PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/31-18:12:10
G02     38.7           50.9               11.6 +/-    0.64      14.4 +/-    0.64  0.020 / 0.020
G05     120.0          68.3               13.0 +/-    0.54      13.8 +/-    0.54  0.020 / 0.030
G12     184.7          53.3               12.0 +/-    0.73      14.5 +/-    0.73  0.030 / 0.060
G25     278.7          58.5               15.6 +/-    0.68      17.9 +/-    0.68  0.050 / 0.050
G29     312.9          33.7                8.8 +/-    0.73      14.3 +/-    0.73  0.040 / 0.040