PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-12:42:40
G01     226.2          17.7                7.9 +/-    2.89      18.3 +/-    2.89  0.160 / 0.300
G03     280.2          71.4                6.8 +/-    0.46       7.1 +/-    0.46  0.110 / 0.320
G14     85.8           24.2                7.6 +/-    0.95      15.2 +/-    0.95  0.040 / 0.040
G16     150.8          42.1                8.4 +/-    0.89      11.9 +/-    0.89  0.040 / 0.040
G22     206.9          69.5                7.1 +/-    0.70       7.5 +/-    0.70  0.040 / 0.050
G23     307.0          37.3                5.2 +/-    0.93       7.8 +/-    0.93  0.030 / 0.050
G26     103.1          54.5                8.5 +/-    0.66      10.1 +/-    0.66  0.110 / 0.180
G31     45.0           33.2                5.4 +/-    0.98       8.9 +/-    0.98  0.110 / 0.200
G32     96.9           10.2                6.3 +/-    1.25      17.5 +/-    1.25  0.060 / 0.110