PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/15-10:27:50
G10     287.5          47.9                6.5 +/-    3.00       8.4 +/-    3.00  0.060 / 0.110
G15     47.4           33.0                3.6 +/-    1.12       5.9 +/-    1.12  0.060 / 0.100
G20     61.9           31.8                3.5 +/-    1.08       5.9 +/-    1.08  0.060 / 0.080
G21     73.9           76.2                6.0 +/-    0.49       6.1 +/-    0.49  0.080 / 0.110
G24     105.2          23.6                5.9 +/-    1.36      11.9 +/-    1.36  0.040 / 0.040
G27     306.5          31.4                7.4 +/-    0.81      12.6 +/-    0.81  0.040 / 0.030
G29     168.2          13.2                6.2 +/-    1.17      16.1 +/-    1.17  0.080 / 0.130
G32     208.0          26.4                7.4 +/-    1.32      14.0 +/-    1.32  0.100 / 0.170