PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-22:58:00
G02     59.4           34.5               11.5 +/-    1.10      18.4 +/-    1.10  0.050 / 0.070
G05     57.6           62.2               14.2 +/-    0.79      15.8 +/-    0.79  0.050 / 0.070
G12     183.6          28.7               18.5 +/-    1.11      33.2 +/-    1.11  0.030 / 0.050
G13     127.8          16.7               18.7 +/-    1.06      44.6 +/-    1.06  0.040 / 0.050
G15     164.7          12.3               24.5 +/-    2.46      64.9 +/-    2.46  0.080 / 0.270
G20     207.8          64.4               18.8 +/-    1.41      20.6 +/-    1.41  0.090 / 0.290
G21     272.6          18.5               15.6 +/-    3.27      35.6 +/-    3.27  0.050 / 0.090
G25     226.5          48.9               16.6 +/-    1.81      21.2 +/-    1.81  0.060 / 0.090
G29     330.8          58.3               13.9 +/-    0.56      16.0 +/-    0.56  0.030 / 0.040