PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/17-21:27:50
G02     44.3           45.9                8.1 +/-    1.12      10.8 +/-    1.12  0.030 / 0.030
G05     101.6          69.4                9.2 +/-    1.07       9.8 +/-    1.07  0.030 / 0.030
G12     185.7          49.4               11.2 +/-    0.47      14.2 +/-    0.47  0.040 / 0.040
G25     269.7          58.6                7.0 +/-    1.88       8.1 +/-    1.88  0.040 / 0.040
G29     316.3          37.8                8.3 +/-    0.91      12.5 +/-    0.91  0.030 / 0.050