PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/23-12:57:50
G01     68.2           32.5                5.4 +/-    1.14       9.0 +/-    1.14  0.030 / 0.030
G07     138.6          28.8                6.1 +/-    0.65      11.0 +/-    0.65  0.040 / 0.030
G11     51.4           28.0                4.8 +/-    1.40       8.9 +/-    1.40  0.080 / 0.100
G13     271.2          37.4                4.6 +/-    4.37       7.0 +/-    4.37  0.050 / 0.120
G15     303.9          13.8                2.1 +/-    2.03       5.5 +/-    2.03  0.080 / 0.090
G17     239.0          72.9                6.1 +/-    0.99       6.4 +/-    0.99  0.080 / 0.120
G18     46.8           16.6                3.7 +/-    1.70       8.9 +/-    1.70  0.070 / 0.080
G19     225.5          40.3                6.4 +/-    1.06       9.2 +/-    1.06  0.080 / 0.080
G28     22.9           58.8                6.7 +/-    1.99       7.7 +/-    1.99  0.160 / 0.230
G30     137.9          61.6                6.4 +/-    0.56       7.2 +/-    0.56  0.200 / 0.270