PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/12-08:27:50
G02     54.7           35.9                2.8 +/-    1.71       4.3 +/-    1.71  0.030 / 0.020
G05     71.3           65.8                3.5 +/-    0.64       3.8 +/-    0.64  0.030 / 0.020
G12     188.1          42.3                4.6 +/-    0.91       6.5 +/-    0.91  0.130 / 0.540
G13     134.9          9.9                -6.1 +/-   13.13     -17.2 +/-   13.13  0.110 / 0.530
G20     206.7          46.1                5.5 +/-    1.04       7.2 +/-    1.04  0.040 / 0.060
G21     265.8          14.5                1.7 +/-    4.80       4.4 +/-    4.80  0.040 / 0.070
G25     251.6          56.3                5.5 +/-    1.95       6.5 +/-    1.95  0.050 / 0.060
G29     324.4          48.8                2.4 +/-    0.63       3.1 +/-    0.63  0.040 / 0.060