PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-08:58:00
G01     127.7          11.0               -9.0 +/-   31.85     -24.7 +/-   31.85  0.030 / 0.030
G07     52.2           69.4                5.7 +/-    0.87       6.0 +/-    0.87  0.030 / 0.040
G08     50.0           38.5                4.1 +/-    2.18       6.1 +/-    2.18  0.210 / 0.310
G09     174.5          32.3                3.5 +/-    1.13       5.9 +/-    1.13  0.270 / 0.330
G11     117.7          35.1                8.1 +/-    1.08      12.8 +/-    1.08  0.040 / 0.030
G13     321.2          11.3               -4.5 +/-   13.40     -12.1 +/-   13.40  0.040 / 0.030
G17     199.2          15.5                3.8 +/-    1.35       9.5 +/-    1.35  0.230 / 0.430
G18     103.2          16.2                5.5 +/-    1.96      13.3 +/-    1.96  0.380 / 0.360
G28     273.8          51.7                5.2 +/-    3.05       6.5 +/-    3.05  0.150 / 0.280
G30     329.9          58.6                3.3 +/-    1.29       3.8 +/-    1.29  0.150 / 0.270