PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/14-07:57:20
G02     47.1           42.8                2.5 +/-    1.45       3.5 +/-    1.45  0.030 / 0.020
G05     98.9           68.9                5.6 +/-    0.63       6.0 +/-    0.63  0.020 / 0.020
G12     191.4          53.1                6.5 +/-    0.58       8.0 +/-    0.58  0.020 / 0.040
G20     203.5          35.8                5.5 +/-    1.59       8.6 +/-    1.59  0.030 / 0.040
G25     271.8          58.0                4.2 +/-    1.78       4.8 +/-    1.78  0.060 / 0.040
G29     317.8          40.4                2.5 +/-    0.79       3.6 +/-    0.79  0.040 / 0.040