PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-13:43:00
G02     201.7          26.9                7.4 +/-    1.62      13.8 +/-    1.62  0.080 / 0.140
G06     168.9          60.9                8.9 +/-    0.36      10.0 +/-    0.36  0.110 / 0.140
G17     32.4           52.3                6.1 +/-    1.11       7.5 +/-    1.11  0.030 / 0.040
G19     351.0          68.2                5.3 +/-    0.51       5.7 +/-    0.51  0.050 / 0.040
G24     306.1          33.1                5.3 +/-    2.18       8.8 +/-    2.18  0.130 / 0.130
G28     96.3           35.0                7.0 +/-    1.01      11.0 +/-    1.01  0.110 / 0.170