PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/11-04:27:40
G02     53.4           37.3                3.9 +/-    0.83       6.0 +/-    0.83  0.040 / 0.070
G05     73.2           66.1                4.9 +/-    0.43       5.3 +/-    0.43  0.040 / 0.050
G12     187.4          42.9                5.9 +/-    0.67       8.2 +/-    0.67  0.030 / 0.020
G20     211.9          25.7                7.5 +/-    1.42      14.5 +/-    1.42  0.050 / 0.020
G21     264.3          12.0                4.0 +/-   12.09      10.6 +/-   12.09  0.320 / 0.520
G25     254.3          56.7                5.7 +/-    1.65       6.7 +/-    1.65  0.290 / 0.410
G29     322.4          46.1                5.3 +/-    0.67       7.0 +/-    0.67  0.060 / 0.050