PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-20:43:00
G01     75.8           33.3               14.0 +/-    1.02      22.9 +/-    1.02  0.100 / 0.290
G07     134.9          35.3               16.1 +/-    1.44      25.4 +/-    1.44  0.090 / 0.260
G11     57.8           34.6               11.6 +/-    0.83      18.5 +/-    0.83  0.030 / 0.050
G13     280.1          37.7               14.7 +/-    0.83      22.3 +/-    0.83  0.030 / 0.060
G15     306.2          14.3                9.8 +/-    1.08      24.9 +/-    1.08  0.060 / 0.110
G17     226.4          60.8               16.0 +/-    0.91      18.1 +/-    0.91  0.050 / 0.100
G18     52.8           20.4               11.5 +/-    1.09      24.9 +/-    1.09  0.030 / 0.100
G19     221.3          37.2               15.5 +/-    1.31      23.7 +/-    1.31  0.050 / 0.070
G28     12.8           60.1               11.8 +/-    0.55      13.4 +/-    0.55  0.050 / 0.110
G30     130.6          64.2               14.8 +/-    0.32      16.3 +/-    0.32  0.060 / 0.110