PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-03:27:10
G02     46.5           43.5                4.2 +/-    1.17       5.9 +/-    1.17  0.090 / 0.260
G05     97.5           68.8                5.3 +/-    0.87       5.6 +/-    0.87  0.120 / 0.440
G12     189.7          52.1                6.8 +/-    0.42       8.4 +/-    0.42  0.050 / 0.060
G20     210.7          12.7                4.9 +/-    4.83      12.8 +/-    4.83  0.040 / 0.050
G25     271.9          58.0                1.6 +/-    1.75       1.8 +/-    1.75  0.030 / 0.040
G29     316.8          38.7                4.4 +/-    1.11       6.5 +/-    1.11  0.030 / 0.040