PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/13-16:12:40
G02     243.0          75.6               10.6 +/-    0.53      11.0 +/-    0.53  0.040 / 0.060
G05     174.7          14.3               12.7 +/-    2.72      32.1 +/-    2.72  0.030 / 0.060
G06     40.4           58.0                9.8 +/-    0.70      11.4 +/-    0.70  0.240 / 0.370
G12     321.6          53.3               11.1 +/-    1.36      13.5 +/-    1.36  0.090 / 0.250
G17     73.8           19.2                9.2 +/-    0.96      20.6 +/-    0.96  0.040 / 0.040
G19     60.4           36.1                9.2 +/-    0.64      14.4 +/-    0.64  0.040 / 0.050
G24     245.8          34.4               12.6 +/-    0.71      20.3 +/-    0.71  0.080 / 0.260
G25     317.1          16.6               10.5 +/-    3.46      25.1 +/-    3.46  0.110 / 0.210