PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-13:42:50
G01     220.3          11.7                6.8 +/-    2.78      18.4 +/-    2.78  0.030 / 0.040
G03     246.3          72.3                6.8 +/-    0.76       7.1 +/-    0.76  0.040 / 0.030
G09     298.1          11.4                2.9 +/-   23.27       8.0 +/-   23.27  0.120 / 0.410
G14     93.2           18.8                8.4 +/-    1.05      18.9 +/-    1.05  0.110 / 0.380
G16     144.0          50.3               10.9 +/-    0.95      13.7 +/-    0.95  0.030 / 0.040
G22     194.6          60.5                9.6 +/-    1.06      10.9 +/-    1.06  0.040 / 0.050
G23     313.2          43.1                6.0 +/-    1.24       8.4 +/-    1.24  0.100 / 0.240
G26     87.2           55.5                7.9 +/-    0.73       9.3 +/-    0.73  0.110 / 0.280
G31     48.4           26.4                7.3 +/-    1.70      13.8 +/-    1.70  0.040 / 0.060