PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-08:58:10
G02     248.0          78.8                4.6 +/-    0.41       4.7 +/-    0.41  0.130 / 0.210
G05     171.3          17.2                5.1 +/-    1.32      12.0 +/-    1.32  0.130 / 0.230
G06     39.4           62.8                4.3 +/-    0.71       4.8 +/-    0.71  0.090 / 0.100
G12     321.2          51.5                4.7 +/-    0.40       5.8 +/-    0.40  0.080 / 0.110
G17     72.5           21.1                4.4 +/-    0.81       9.4 +/-    0.81  0.040 / 0.040
G19     59.5           36.9                3.5 +/-    1.22       5.3 +/-    1.22  0.030 / 0.040
G24     245.4          34.3                7.1 +/-    1.59      11.5 +/-    1.59  0.020 / 0.020
G25     317.0          13.4                3.1 +/-    2.57       8.0 +/-    2.57  0.030 / 0.030