PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/07-08:57:40
G02     58.0           33.1                1.8 +/-    1.26       3.0 +/-    1.26  0.030 / 0.030
G05     62.9           63.0                4.5 +/-    0.39       5.0 +/-    0.39  0.020 / 0.020
G12     187.1          37.7                5.8 +/-    0.93       8.8 +/-    0.93  0.040 / 0.060
G13     131.8          12.7                6.3 +/-    1.93      16.6 +/-    1.93  0.040 / 0.050
G15     164.5          10.0               -8.2 +/-    8.22     -22.7 +/-    8.22  0.190 / 0.270
G20     208.5          50.8                6.9 +/-    0.57       8.6 +/-    0.57  0.190 / 0.230
G21     269.2          17.3                4.6 +/-    1.68      10.7 +/-    1.68  0.060 / 0.070
G25     243.8          54.2                5.3 +/-    2.43       6.3 +/-    2.43  0.040 / 0.080
G29     327.3          52.9                3.4 +/-    1.04       4.2 +/-    1.04  0.070 / 0.100