PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/20-20:43:00
G10     296.8          52.4                9.2 +/-    1.61      11.3 +/-    1.61  0.040 / 0.040
G15     46.4           29.5                8.8 +/-    1.55      15.5 +/-    1.55  0.040 / 0.040
G20     351.7          65.3                9.5 +/-    0.47      10.3 +/-    0.47  0.110 / 0.090
G21     88.3           75.5               10.8 +/-    0.43      11.1 +/-    0.43  0.180 / 0.090
G24     101.1          26.1                9.0 +/-    1.29      17.2 +/-    1.29  0.050 / 0.090
G27     302.6          33.6                8.7 +/-    1.03      14.1 +/-    1.03  0.060 / 0.080
G32     209.3          30.8               10.8 +/-    1.84      18.5 +/-    1.84  0.070 / 0.110