PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-12:27:40
G10     307.0          54.5                2.5 +/-    1.03       3.0 +/-    1.03  0.110 / 0.070
G14     212.5          16.4                4.3 +/-    2.30      10.2 +/-    2.30  0.070 / 0.100
G15     45.4           20.9                2.3 +/-    2.33       5.0 +/-    2.33  0.230 / 0.210
G20     74.1           18.8                1.6 +/-    1.50       3.7 +/-    1.50  0.180 / 0.300
G21     115.7          67.3                3.4 +/-    0.82       3.6 +/-    0.82  0.030 / 0.030
G24     90.9           28.8                2.5 +/-    0.99       4.4 +/-    0.99  0.030 / 0.040
G27     291.6          37.0                7.8 +/-    2.18      12.0 +/-    2.18  0.100 / 0.230
G32     213.8          39.4                5.2 +/-    1.73       7.6 +/-    1.73  0.100 / 0.210