PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-13:27:50
G01     221.1          12.6                4.7 +/-    3.12      12.5 +/-    3.12  0.110 / 0.240
G03     252.0          72.5                9.8 +/-    0.56      10.2 +/-    0.56  0.140 / 0.240
G14     92.1           19.6                7.6 +/-    1.76      17.0 +/-    1.76  0.030 / 0.040
G16     145.0          49.2               10.1 +/-    0.82      12.8 +/-    0.82  0.030 / 0.050
G22     196.1          62.0               10.0 +/-    0.56      11.2 +/-    0.56  0.040 / 0.030
G23     312.3          42.3                7.5 +/-    1.05      10.5 +/-    1.05  0.040 / 0.030
G26     89.4           55.5                8.4 +/-    1.35       9.9 +/-    1.35  0.030 / 0.050
G31     47.9           27.3                4.8 +/-    2.34       8.8 +/-    2.34  0.040 / 0.050