PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-07:57:30
G02     204.3          42.0                5.4 +/-    0.67       7.5 +/-    0.67  0.090 / 0.130
G06     166.1          71.3                4.8 +/-    0.45       5.1 +/-    0.45  0.090 / 0.140
G12     310.2          18.1                3.5 +/-    3.16       8.2 +/-    3.16  0.280 / 0.150
G17     41.7           44.7                2.1 +/-    1.16       2.9 +/-    1.16  0.070 / 0.120
G19     14.6           61.1                1.6 +/-    0.64       1.9 +/-    0.64  0.040 / 0.050
G24     293.0          39.6                6.5 +/-    4.51       9.5 +/-    4.51  0.070 / 0.040
G28     108.1          26.8                5.3 +/-    1.24      10.0 +/-    1.24  0.030 / 0.020