PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/15-06:12:50
G10     284.5          46.8                4.2 +/-    2.83       5.6 +/-    2.83  0.070 / 0.090
G15     48.6           36.3                3.6 +/-    0.76       5.6 +/-    0.76  0.100 / 0.090
G20     24.0           61.7                3.5 +/-    0.97       4.0 +/-    0.97  0.030 / 0.030
G21     56.7           77.4                4.4 +/-    0.50       4.5 +/-    0.50  0.030 / 0.030
G24     106.8          22.4                5.0 +/-    1.06      10.4 +/-    1.06  0.080 / 0.150
G27     308.9          29.7                4.5 +/-    0.82       8.0 +/-    0.82  0.090 / 0.140
G29     168.9          16.6                5.1 +/-    1.76      12.3 +/-    1.76  0.040 / 0.040
G32     207.0          24.7                6.7 +/-    2.22      13.2 +/-    2.22  0.040 / 0.040