PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-08:12:40
G10     309.4          55.3                4.7 +/-    1.77       5.5 +/-    1.77  0.040 / 0.080
G14     213.3          15.6                6.5 +/-    1.59      16.0 +/-    1.59  0.040 / 0.070
G15     45.5           20.7                3.5 +/-    2.17       7.7 +/-    2.17  0.220 / 0.330
G20     60.5           42.2                5.6 +/-    1.15       7.9 +/-    1.15  0.230 / 0.400
G21     116.7          68.3                7.3 +/-    0.60       7.8 +/-    0.60  0.070 / 0.080
G24     88.6           29.0                6.7 +/-    1.06      12.0 +/-    1.06  0.050 / 0.080
G27     290.5          37.1                8.7 +/-    2.31      13.3 +/-    2.31  0.030 / 0.030
G32     214.3          41.6                8.7 +/-    0.82      12.3 +/-    0.82  0.030 / 0.040