PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-08:58:00
G08     296.6          21.3                3.8 +/-    1.47       8.1 +/-    1.47  0.060 / 0.100
G10     7.4            63.1                1.8 +/-    0.69       1.9 +/-    0.69  0.060 / 0.100
G14     229.7          42.5                6.5 +/-    1.13       9.1 +/-    1.13  0.080 / 0.140
G20     86.1           25.8                4.4 +/-    1.06       8.5 +/-    1.06  0.090 / 0.090
G21     146.6          40.2                5.7 +/-    1.13       8.3 +/-    1.13  0.080 / 0.190
G24     55.8           25.5                2.9 +/-    1.29       5.6 +/-    1.29  0.080 / 0.180
G27     253.5          31.4                5.4 +/-    1.32       9.1 +/-    1.32  0.030 / 0.030
G32     248.3          69.7                6.8 +/-    0.73       7.2 +/-    0.73  0.030 / 0.030