PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-01:57:30
G02     56.2           35.2                7.7 +/-    0.65      12.1 +/-    0.65  0.110 / 0.260
G05     64.5           63.6                9.7 +/-    0.61      10.7 +/-    0.61  0.110 / 0.280
G12     185.3          37.3               12.3 +/-    2.24      18.8 +/-    2.24  0.070 / 0.120
G13     132.0          12.0               14.5 +/-    2.79      38.8 +/-    2.79  0.050 / 0.090
G21     267.3          14.0               12.4 +/-    1.79      31.5 +/-    1.79  0.030 / 0.040
G25     245.7          54.8               11.2 +/-    0.62      13.3 +/-    0.62  0.030 / 0.040
G29     324.7          49.3               10.9 +/-    1.44      13.9 +/-    1.44  0.070 / 0.120