PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-13:27:50
G01     224.9          16.5                5.9 +/-    3.36      14.2 +/-    3.36  0.030 / 0.050
G03     271.8          72.5                5.7 +/-    0.57       6.0 +/-    0.57  0.040 / 0.040
G14     87.4           23.0                7.0 +/-    0.81      14.4 +/-    0.81  0.110 / 0.280
G16     150.1          43.6                9.5 +/-    1.15      13.1 +/-    1.15  0.110 / 0.200
G22     202.1          67.4                8.2 +/-    1.04       8.9 +/-    1.04  0.030 / 0.040
G23     308.1          38.2                5.2 +/-    1.17       7.8 +/-    1.17  0.030 / 0.040
G26     100.4          55.1                7.9 +/-    1.00       9.4 +/-    1.00  0.100 / 0.220
G31     45.6           32.0                6.1 +/-    0.43      10.3 +/-    0.43  0.100 / 0.320