PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-09:42:40
G08     279.5          20.2                5.5 +/-    2.16      12.1 +/-    2.16  0.050 / 0.080
G10     44.2           61.3                4.7 +/-    0.40       5.3 +/-    0.40  0.050 / 0.080
G14     248.0          56.6                7.9 +/-    0.95       9.3 +/-    0.95  0.030 / 0.030
G18     316.0          23.6                3.0 +/-    2.17       6.1 +/-    2.17  0.030 / 0.040
G20     99.8           14.2                5.0 +/-    2.05      12.6 +/-    2.05  0.100 / 0.140
G21     152.9          23.5                5.2 +/-    2.15      10.4 +/-    2.15  0.070 / 0.170
G24     43.6           15.9                3.4 +/-    1.29       8.4 +/-    1.29  0.100 / 0.240
G27     237.9          21.3                6.9 +/-    1.74      14.7 +/-    1.74  0.100 / 0.300
G31     178.7          23.5                4.4 +/-    1.96       8.9 +/-    1.96  0.100 / 0.270
G32     311.4          76.7                7.8 +/-    0.63       8.0 +/-    0.63  0.150 / 0.360