PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-14:13:00
G03     212.7          62.9                7.0 +/-    0.76       7.8 +/-    0.76  0.030 / 0.050
G07     253.0          15.9                8.1 +/-    1.42      19.8 +/-    1.42  0.040 / 0.060
G09     305.9          21.1                6.0 +/-    1.64      12.8 +/-    1.64  0.080 / 0.220
G14     103.9          10.3                8.5 +/-    3.20      23.6 +/-    3.20  0.090 / 0.260
G16     123.6          61.6               10.9 +/-    1.01      12.2 +/-    1.01  0.060 / 0.080
G22     187.3          46.2                8.9 +/-    1.45      11.7 +/-    1.45  0.050 / 0.070
G23     323.7          53.6                9.4 +/-    0.85      11.3 +/-    0.85  0.140 / 0.530
G26     64.4           50.7                7.4 +/-    0.71       9.3 +/-    0.71  0.120 / 0.400
G31     55.0           16.1                7.1 +/-    1.03      17.2 +/-    1.03  0.030 / 0.040