PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-11:43:10
G02     55.9           35.1                3.2 +/-    1.56       5.0 +/-    1.56  0.030 / 0.020
G05     69.5           65.8                2.6 +/-    0.46       2.8 +/-    0.46  0.030 / 0.020
G12     187.9          40.6                3.6 +/-    0.80       5.2 +/-    0.80  0.040 / 0.060
G13     134.0          10.9               -0.1 +/-   15.41      -0.2 +/-   15.41  0.050 / 0.070
G20     206.4          50.0                4.2 +/-    0.57       5.3 +/-    0.57  0.040 / 0.050
G21     267.9          17.5                2.3 +/-    6.88       5.4 +/-    6.88  0.040 / 0.040
G25     247.3          55.6                3.0 +/-    1.74       3.5 +/-    1.74  0.050 / 0.040
G29     326.9          52.1                1.0 +/-    1.45       1.2 +/-    1.45  0.040 / 0.060