PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/13-08:27:50
G02     56.1           34.7                2.9 +/-    2.09       4.7 +/-    2.09  0.030 / 0.030
G05     67.4           64.7                4.2 +/-    0.67       4.6 +/-    0.67  0.040 / 0.030
G12     187.6          40.3                5.9 +/-    0.76       8.6 +/-    0.76  0.040 / 0.070
G13     133.6          11.1                4.6 +/-    2.33      12.5 +/-    2.33  0.040 / 0.050
G20     207.5          47.9                5.1 +/-    0.47       6.6 +/-    0.47  0.150 / 0.270
G21     267.2          15.6                3.1 +/-    4.29       7.7 +/-    4.29  0.160 / 0.270
G25     248.2          55.5                4.6 +/-    2.06       5.5 +/-    2.06  0.040 / 0.050
G29     325.5          50.4                3.2 +/-    1.42       4.0 +/-    1.42  0.050 / 0.060