PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-04:57:50
G10     257.3          31.7                8.0 +/-    2.74      13.6 +/-    2.74  0.040 / 0.040
G13     47.6           25.5                5.7 +/-    1.01      11.1 +/-    1.01  0.050 / 0.050
G15     72.4           54.9                5.6 +/-    0.55       6.7 +/-    0.55  0.120 / 0.320
G16     287.5          14.7                5.7 +/-    2.43      14.4 +/-    2.43  0.100 / 0.310
G20     314.9          68.7                6.3 +/-    0.63       6.7 +/-    0.63  0.190 / 0.340
G21     343.3          65.2                3.7 +/-    1.02       4.0 +/-    1.02  0.150 / 0.310
G26     259.6          12.4                8.8 +/-    1.03      23.2 +/-    1.03  0.070 / 0.110
G27     321.8          11.4               -3.7 +/-   26.76     -10.0 +/-   26.76  0.080 / 0.120
G29     166.9          42.1                7.9 +/-    0.97      11.1 +/-    0.97  0.070 / 0.170