PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-10:27:50
G08     274.4          18.6                3.5 +/-    1.19       8.0 +/-    1.19  0.040 / 0.050
G10     55.4           59.7                2.8 +/-    0.81       3.2 +/-    0.81  0.050 / 0.060
G11     314.4          13.9                2.2 +/-    1.49       5.6 +/-    1.49  0.120 / 0.310
G14     257.0          60.9                4.0 +/-    0.50       4.5 +/-    0.50  0.150 / 0.230
G18     314.1          28.4                3.6 +/-    3.49       6.5 +/-    3.49  0.110 / 0.200
G21     154.1          17.9                3.5 +/-    1.66       8.0 +/-    1.66  0.160 / 0.210
G24     40.9           12.1                2.8 +/-    1.69       7.5 +/-    1.69  0.100 / 0.270
G27     233.4          17.6                6.1 +/-    1.48      14.3 +/-    1.48  0.110 / 0.350
G31     177.5          29.0                4.8 +/-    1.64       8.6 +/-    1.64  0.030 / 0.040
G32     335.0          75.1                3.7 +/-    0.89       3.8 +/-    0.89  0.030 / 0.030