PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-21:27:50
G01     71.2           33.0               13.2 +/-    1.38      21.8 +/-    1.38  0.130 / 0.220
G07     137.3          31.8               15.9 +/-    1.18      26.9 +/-    1.18  0.090 / 0.220
G11     55.0           32.3               12.0 +/-    1.13      20.1 +/-    1.13  0.110 / 0.260
G13     275.3          37.4               14.5 +/-    2.85      22.0 +/-    2.85  0.110 / 0.250
G15     302.8          15.3                8.9 +/-    0.77      21.9 +/-    0.77  0.030 / 0.030
G17     231.2          63.5               17.7 +/-    1.14      19.6 +/-    1.14  0.030 / 0.030
G18     49.7           18.7               12.5 +/-    1.91      28.3 +/-    1.91  0.060 / 0.080
G19     224.0          40.9               17.2 +/-    1.62      24.6 +/-    1.62  0.050 / 0.080
G28     19.8           59.2               14.6 +/-    1.46      16.7 +/-    1.46  0.040 / 0.060
G30     135.1          60.2               16.1 +/-    0.37      18.2 +/-    0.37  0.040 / 0.050