PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/13-08:27:40
G02     56.1           34.7                1.5 +/-    1.24       2.3 +/-    1.24  0.130 / 0.300
G05     67.4           64.7                4.3 +/-    0.37       4.7 +/-    0.37  0.180 / 0.340
G12     187.6          40.3                4.6 +/-    1.72       6.7 +/-    1.72  0.040 / 0.030
G13     133.6          11.1                2.6 +/-   16.27       7.1 +/-   16.27  0.040 / 0.030
G20     207.5          47.9                5.8 +/-    1.19       7.5 +/-    1.19  0.040 / 0.070
G21     267.2          15.6                4.1 +/-    1.83      10.0 +/-    1.83  0.030 / 0.070
G25     248.2          55.5                5.2 +/-    1.42       6.1 +/-    1.42  0.120 / 0.060
G29     325.5          50.4                2.8 +/-    1.28       3.5 +/-    1.28  0.060 / 0.080