PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-21:43:00
G02     48.6           43.0              -43.2 +/-   54.48     -59.9 +/-   54.48  0.150 / 0.440
G05     90.8           70.7                9.8 +/-    2.23      10.3 +/-    2.23  0.190 / 0.470
G12     186.6          43.4               22.5 +/-   11.47      31.0 +/-   11.47  0.050 / 0.070
G20     202.0          49.4                1.9 +/-   11.28       2.4 +/-   11.28  0.050 / 0.070
G21     262.4          10.5               -1.3 +/-   25.59      -3.5 +/-   25.59  0.070 / 0.050
G25     246.2          58.0               -2.2 +/-   12.44      -2.5 +/-   12.44  0.060 / 0.050
G29     322.3          46.3                7.7 +/-    1.00      10.2 +/-    1.00  0.070 / 0.060