PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-07:27:40
G02     43.7           46.0                2.3 +/-    0.40       3.0 +/-    0.40  0.030 / 0.060
G05     112.0          68.3                4.0 +/-    0.67       4.3 +/-    0.67  0.030 / 0.040
G06     58.9           10.7                2.2 +/-    5.61       6.1 +/-    5.61  0.100 / 0.180
G12     193.5          57.9                6.1 +/-    1.38       7.1 +/-    1.38  0.110 / 0.170
G20     202.5          31.2                4.3 +/-    1.57       7.4 +/-    1.57  0.160 / 0.360
G25     280.7          57.4                4.8 +/-    1.22       5.6 +/-    1.22  0.120 / 0.290
G29     314.9          36.7                4.3 +/-    1.34       6.7 +/-    1.34  0.030 / 0.040