PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-13:43:10
G01     320.7          13.3               -2.8 +/-   23.61      -7.3 +/-   23.61  0.160 / 0.340
G08     261.2          16.3                5.9 +/-    0.90      14.2 +/-    0.90  0.090 / 0.220
G10     70.7           55.4                5.3 +/-    0.93       6.3 +/-    0.93  0.030 / 0.020
G11     307.2          20.9                3.3 +/-    1.48       7.2 +/-    1.48  0.020 / 0.020
G14     280.6          69.6                5.3 +/-    0.60       5.6 +/-    0.60  0.040 / 0.040
G18     307.7          39.1                4.3 +/-    0.97       6.4 +/-    0.97  0.040 / 0.040
G20     100.2          33.0                6.1 +/-    0.82      10.0 +/-    0.82  0.030 / 0.020
G27     230.4          13.4                2.3 +/-    1.64       6.1 +/-    1.64  0.030 / 0.030
G31     179.7          32.7                6.8 +/-    1.65      11.2 +/-    1.65  0.080 / 0.090
G32     342.3          72.7                5.5 +/-    0.39       5.8 +/-    0.39  0.070 / 0.080