PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-07:27:40
G02     202.8          37.6                4.4 +/-    0.78       6.6 +/-    0.78  0.060 / 0.130
G06     170.0          66.8                4.7 +/-    0.23       5.0 +/-    0.23  0.060 / 0.100
G12     307.9          14.8                0.7 +/-    2.80       1.8 +/-    2.80  0.030 / 0.050
G17     37.7           47.9                2.8 +/-    1.79       3.6 +/-    1.79  0.040 / 0.030
G19     6.6            63.9                2.3 +/-    0.49       2.5 +/-    0.49  0.110 / 0.220
G24     297.9          37.8                0.7 +/-    2.46       1.0 +/-    2.46  0.090 / 0.250
G28     104.2          29.7                5.3 +/-    0.80       9.4 +/-    0.80  0.020 / 0.020