PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-16:12:40
G08     308.4          20.2                5.1 +/-    1.63      11.2 +/-    1.63  0.030 / 0.040
G10     332.4          60.1                6.1 +/-    0.57       6.9 +/-    0.57  0.040 / 0.040
G14     217.6          31.0                8.0 +/-    3.07      13.6 +/-    3.07  0.040 / 0.030
G15     46.8           11.7                6.5 +/-    2.94      17.6 +/-    2.94  0.040 / 0.030
G20     37.1           60.5                6.9 +/-    0.63       7.8 +/-    0.63  0.070 / 0.090
G21     134.0          53.8               10.2 +/-    1.19      12.3 +/-    1.19  0.060 / 0.080
G24     70.2           28.1                6.2 +/-    1.88      11.3 +/-    1.88  0.110 / 0.150
G27     278.7          36.7                9.1 +/-    1.37      13.9 +/-    1.37  0.150 / 0.190
G32     222.6          50.7                9.1 +/-    2.01      11.3 +/-    2.01  0.120 / 0.260