PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-11:13:10
G02     33.0           55.9                4.0 +/-    0.40       4.7 +/-    0.40  0.030 / 0.040
G05     143.7          59.9                7.9 +/-    0.75       9.0 +/-    0.75  0.030 / 0.040
G12     208.1          71.4                4.9 +/-    1.77       5.1 +/-    1.77  0.110 / 0.180
G19     98.7           10.3                4.3 +/-    2.49      12.0 +/-    2.49  0.090 / 0.220
G20     199.4          21.5                5.5 +/-    0.93      11.6 +/-    0.93  0.020 / 0.040
G25     300.3          52.0                3.0 +/-    1.47       3.7 +/-    1.47  0.030 / 0.030
G29     307.5          29.5                1.9 +/-    1.88       3.3 +/-    1.88  0.050 / 0.050