PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/20-22:27:50
G07     62.0           67.5               10.1 +/-    0.65      10.8 +/-    0.65  0.020 / 0.030
G08     49.7           38.0                9.0 +/-    0.74      13.5 +/-    0.74  0.040 / 0.030
G09     178.2          37.0               10.5 +/-    0.64      16.1 +/-    0.64  0.120 / 0.120
G11     116.8          35.6               11.7 +/-    1.06      18.4 +/-    1.06  0.090 / 0.090
G13     321.0          11.8               -5.4 +/-   14.41     -14.5 +/-   14.41  0.050 / 0.070
G17     198.8          16.2               14.0 +/-    4.19      33.9 +/-    4.19  0.070 / 0.080
G18     100.4          16.3               10.5 +/-    1.24      25.3 +/-    1.24  0.060 / 0.320
G27     37.7           9.7                 7.4 +/-    2.77      20.8 +/-    2.77  0.130 / 0.230
G28     271.7          50.0               10.7 +/-    2.45      13.4 +/-    2.45  0.110 / 0.240
G30     331.9          60.1                8.3 +/-    0.65       9.4 +/-    0.65  0.090 / 0.240