PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-13:28:00
G02     200.6          20.2                6.8 +/-    2.59      14.9 +/-    2.59  0.110 / 0.390
G06     172.3          53.3                8.0 +/-    0.51       9.7 +/-    0.51  0.100 / 0.200
G13     228.8          13.1                6.1 +/-    1.86      16.0 +/-    1.86  0.190 / 0.270
G17     25.7           57.6                5.7 +/-    1.22       6.6 +/-    1.22  0.130 / 0.350
G19     331.1          71.1                5.6 +/-    0.30       5.9 +/-    0.30  0.080 / 0.130
G24     311.0          28.4                3.8 +/-    1.33       6.8 +/-    1.33  0.060 / 0.100
G28     88.9           39.1                6.3 +/-    1.11       9.2 +/-    1.11  0.030 / 0.030
G30     157.5          15.3                6.9 +/-    2.72      17.0 +/-    2.72  0.020 / 0.030