PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-08:12:50
G02     58.0           33.1                2.2 +/-    1.19       3.7 +/-    1.19  0.140 / 0.420
G05     62.7           62.8                3.1 +/-    0.63       3.4 +/-    0.63  0.120 / 0.420
G12     187.0          37.7                5.4 +/-    1.53       8.2 +/-    1.53  0.030 / 0.030
G13     131.7          12.7                4.4 +/-    3.06      11.5 +/-    3.06  0.040 / 0.030
G15     164.5          10.0               -9.6 +/-   11.31     -26.8 +/-   11.31  0.050 / 0.060
G20     208.7          50.3                4.6 +/-    1.21       5.8 +/-    1.21  0.050 / 0.070
G21     269.1          16.9                4.6 +/-    2.94      10.9 +/-    2.94  0.070 / 0.070
G25     244.0          54.2                5.1 +/-    1.19       6.1 +/-    1.19  0.070 / 0.090
G29     327.0          52.5                1.5 +/-    1.05       1.8 +/-    1.05  0.090 / 0.420