PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/31-08:27:40
G10     259.5          33.1                5.6 +/-    2.30       9.2 +/-    2.30  0.130 / 0.290
G13     46.2           24.1                4.1 +/-    2.23       8.1 +/-    2.23  0.140 / 0.400
G15     67.3           52.7                5.3 +/-    0.89       6.5 +/-    0.89  0.110 / 0.240
G16     286.1          13.9                5.0 +/-    1.82      12.7 +/-    1.82  0.130 / 0.340
G20     32.6           58.0                4.2 +/-    0.66       4.8 +/-    0.66  0.030 / 0.040
G21     349.4          67.5                4.3 +/-    1.04       4.6 +/-    1.04  0.040 / 0.040
G24     126.5          9.9               -13.8 +/-   20.71     -38.5 +/-   20.71  0.230 / 0.230
G26     258.1          11.2                7.1 +/-    1.55      19.2 +/-    1.55  0.280 / 0.350
G27     321.0          13.7                1.7 +/-    2.12       4.3 +/-    2.12  0.040 / 0.070
G29     166.9          38.5                6.6 +/-    0.68       9.8 +/-    0.68  0.040 / 0.050