PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/12-20:12:50
G01     61.2           30.9               12.5 +/-    1.05      21.5 +/-    1.05  0.130 / 0.320
G07     141.9          23.6               13.6 +/-    1.87      27.4 +/-    1.87  0.170 / 0.280
G11     49.2           25.3               11.3 +/-    1.89      21.9 +/-    1.89  0.040 / 0.040
G13     263.9          35.5               14.6 +/-    1.36      23.0 +/-    1.36  0.050 / 0.040
G15     295.1          16.2               11.4 +/-    1.27      27.5 +/-    1.27  0.110 / 0.140
G17     250.1          72.5               12.9 +/-    0.43      13.5 +/-    0.43  0.080 / 0.120
G18     43.2           13.8                9.9 +/-    2.22      25.3 +/-    2.22  0.040 / 0.070
G19     231.5          48.5               13.5 +/-    1.61      17.3 +/-    1.61  0.040 / 0.050
G28     34.7           56.9               14.2 +/-    1.10      16.6 +/-    1.10  0.130 / 0.290
G30     142.8          52.3               13.5 +/-    0.32      16.6 +/-    0.32  0.200 / 0.320