PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/20-13:57:40
G01     319.6          17.0                3.9 +/-    1.88       9.2 +/-    1.88  0.140 / 0.210
G08     257.2          14.1                2.2 +/-    2.75       5.6 +/-    2.75  0.170 / 0.190
G10     78.0           53.1                3.7 +/-    0.69       4.5 +/-    0.69  0.040 / 0.030
G11     303.4          23.1                3.5 +/-    0.97       7.1 +/-    0.97  0.040 / 0.020
G14     294.3          71.1                3.9 +/-    0.41       4.1 +/-    0.41  0.030 / 0.030
G18     303.8          42.5                4.1 +/-    1.08       5.8 +/-    1.08  0.040 / 0.020
G20     104.2          29.9                6.5 +/-    1.32      11.5 +/-    1.32  0.050 / 0.040
G22     300.6          11.2               -0.2 +/-    2.03      -0.4 +/-    2.03  0.040 / 0.030
G31     179.0          37.4                7.1 +/-    1.18      10.8 +/-    1.18  0.080 / 0.160
G32     355.1          70.3                3.4 +/-    0.52       3.6 +/-    0.52  0.090 / 0.140