PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-14:57:40
G02     257.6          76.7                5.8 +/-    0.68       6.0 +/-    0.68  0.120 / 0.110
G05     171.6          20.1                9.3 +/-    1.89      20.5 +/-    1.89  0.090 / 0.120
G06     40.0           50.7                7.1 +/-    0.85       8.9 +/-    0.85  0.030 / 0.040
G12     321.3          62.1                5.0 +/-    0.73       5.5 +/-    0.73  0.040 / 0.040
G17     77.1           17.0                6.6 +/-    2.26      15.6 +/-    2.26  0.110 / 0.160
G19     60.3           38.3                7.0 +/-    2.08      10.5 +/-    2.08  0.130 / 0.180
G24     235.7          30.3                5.4 +/-    1.80       9.4 +/-    1.80  0.130 / 0.250
G25     317.4          20.2                4.2 +/-    2.44       9.3 +/-    2.44  0.130 / 0.260