PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-05:12:30
G10     265.9          37.4                8.4 +/-    1.28      12.8 +/-    1.28  0.210 / 0.460
G13     42.5           19.3                3.8 +/-    2.61       8.5 +/-    2.61  0.220 / 0.340
G15     60.4           49.6                5.6 +/-    0.61       7.1 +/-    0.61  0.120 / 0.150
G16     279.2          12.4                7.7 +/-    2.14      20.2 +/-    2.14  0.110 / 0.140
G20     338.0          68.6                5.2 +/-    0.51       5.6 +/-    0.51  0.050 / 0.040
G21     359.0          71.0                5.5 +/-    0.68       5.8 +/-    0.68  0.050 / 0.030
G24     120.9          13.6                6.4 +/-    1.50      16.4 +/-    1.50  0.200 / 0.320
G27     318.9          18.3                6.2 +/-    2.27      14.2 +/-    2.27  0.190 / 0.340
G29     168.2          32.8                7.3 +/-    1.26      12.1 +/-    1.26  0.200 / 0.310