PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/12/18-14:27:40
G10     290.1          50.3                7.0 +/-    2.86       8.8 +/-    2.86  0.070 / 0.090
G15     46.7           30.0                5.2 +/-    1.44       9.2 +/-    1.44  0.070 / 0.080
G20     346.3          65.5                5.5 +/-    0.51       6.0 +/-    0.51  0.080 / 0.110
G21     75.2           75.8                7.5 +/-    0.95       7.7 +/-    0.95  0.110 / 0.090
G24     106.1          23.9                9.6 +/-    1.07      19.2 +/-    1.07  0.150 / 0.260
G27     307.0          31.4                6.2 +/-    1.89      10.5 +/-    1.89  0.120 / 0.230
G29     168.2          14.4                7.8 +/-    1.38      19.6 +/-    1.38  0.040 / 0.040
G32     207.2          27.3                7.9 +/-    1.36      14.6 +/-    1.36  0.040 / 0.040