PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-16:58:00
G07     335.8          59.4               13.7 +/-    0.66      15.7 +/-    0.66  0.070 / 0.130
G08     105.9          50.0               15.2 +/-    1.04      19.2 +/-    1.04  0.080 / 0.110
G09     208.4          79.3               14.1 +/-    0.38      14.3 +/-    0.38  0.040 / 0.050
G11     147.7          11.1               15.7 +/-   13.49      42.8 +/-   13.49  0.040 / 0.050
G16     45.1           13.9                8.5 +/-    2.05      21.6 +/-    2.05  0.090 / 0.190
G23     153.7          46.9               15.7 +/-    0.84      20.7 +/-    0.84  0.090 / 0.200
G27     61.7           35.0               11.7 +/-    0.50      18.5 +/-    0.50  0.080 / 0.310
G28     232.5          21.4               15.7 +/-    1.43      33.3 +/-    1.43  0.110 / 0.250
G30     299.0          33.5               12.0 +/-    1.62      19.6 +/-    1.62  0.040 / 0.070