PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-19:42:50
G02     56.1           36.5                9.3 +/-    0.84      14.4 +/-    0.84  0.030 / 0.030
G05     62.5           63.7                9.7 +/-    0.48      10.7 +/-    0.48  0.030 / 0.030
G12     181.7          31.6               12.8 +/-    1.17      21.8 +/-    1.17  0.140 / 0.370
G13     129.7          13.6               14.2 +/-    2.38      36.5 +/-    2.38  0.150 / 0.310
G21     269.0          14.8               10.8 +/-    2.18      27.0 +/-    2.18  0.070 / 0.080
G25     238.8          53.5               12.2 +/-    5.04      14.8 +/-    5.04  0.080 / 0.080
G29     325.8          50.9               10.8 +/-    1.07      13.5 +/-    1.07  0.120 / 0.080