PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-12:42:40
G10     248.5          24.4                3.8 +/-    1.41       7.4 +/-    1.41  0.160 / 0.330
G13     56.5           32.0                4.9 +/-    1.04       8.3 +/-    1.04  0.120 / 0.390
G15     88.5           56.8                6.1 +/-    0.44       7.2 +/-    0.44  0.030 / 0.050
G16     300.5          14.4                2.1 +/-    1.50       5.2 +/-    1.50  0.030 / 0.060
G18     268.1          56.9                8.1 +/-    0.66       9.5 +/-    0.66  0.040 / 0.050
G20     37.2           54.9                5.0 +/-    0.60       6.0 +/-    0.60  0.030 / 0.050
G21     335.6          61.0                5.0 +/-    0.55       5.6 +/-    0.55  0.070 / 0.090
G26     271.1          16.4                5.2 +/-    1.50      12.5 +/-    1.50  0.080 / 0.130
G29     162.8          50.0                6.6 +/-    2.60       8.3 +/-    2.60  0.150 / 0.410