PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-13:28:10
G01     224.6          16.1                6.3 +/-    3.31      15.3 +/-    3.31  0.200 / 0.290
G03     270.2          72.6                7.9 +/-    0.41       8.2 +/-    0.41  0.450 / 0.340
G14     87.8           22.7                7.4 +/-    3.16      15.2 +/-    3.16  0.030 / 0.040
G16     149.7          44.1                8.9 +/-    1.65      12.2 +/-    1.65  0.030 / 0.040
G22     201.4          67.0                8.6 +/-    0.23       9.2 +/-    0.23  0.030 / 0.030
G23     308.5          38.5                6.3 +/-    1.14       9.4 +/-    1.14  0.030 / 0.040
G26     99.5           55.1                8.8 +/-    0.60      10.4 +/-    0.60  0.110 / 0.220
G31     45.8           31.6                7.1 +/-    1.14      12.0 +/-    1.14  0.100 / 0.230