PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-08:58:10
G08     265.6          17.6                7.7 +/-    1.86      18.0 +/-    1.86  0.030 / 0.030
G10     65.9           56.6                5.2 +/-    0.56       6.1 +/-    0.56  0.030 / 0.030
G11     309.8          18.8                4.7 +/-    3.28      10.6 +/-    3.28  0.120 / 0.300
G14     271.8          68.0                6.6 +/-    0.80       7.0 +/-    0.80  0.150 / 0.270
G18     310.8          35.2                5.9 +/-    1.70       9.3 +/-    1.70  0.130 / 0.250
G20     97.4           35.2                5.8 +/-    0.84       9.2 +/-    0.84  0.280 / 0.360
G21     154.9          12.5                3.9 +/-    1.42      10.4 +/-    1.42  0.040 / 0.060
G27     231.7          15.3                6.5 +/-    2.08      16.2 +/-    2.08  0.040 / 0.060
G31     178.1          31.9                6.6 +/-    0.78      11.1 +/-    0.78  0.110 / 0.230
G32     327.7          74.0                6.9 +/-    0.61       7.2 +/-    0.61  0.130 / 0.270