PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-15:27:30
G10     294.9          51.3                6.1 +/-    0.76       7.6 +/-    0.76  0.030 / 0.040
G14     209.4          10.4               -7.6 +/-   13.24     -21.0 +/-   13.24  0.030 / 0.050
G15     46.6           30.9                4.5 +/-    0.40       7.7 +/-    0.40  0.170 / 0.000
G20     347.9          65.4                5.2 +/-    0.39       5.6 +/-    0.39  0.370 / 0.630
G21     96.6           72.1                7.4 +/-    0.57       7.7 +/-    0.57  0.040 / 0.030
G24     95.2           25.3                7.5 +/-    1.85      14.6 +/-    1.85  0.040 / 0.040
G27     304.9          31.5                5.7 +/-    1.38       9.7 +/-    1.38  0.080 / 0.130
G32     209.8          28.9                7.8 +/-    0.88      14.0 +/-    0.88  0.090 / 0.140