PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-13:27:50
G08     301.3          20.9                4.2 +/-    2.04       9.1 +/-    2.04  0.040 / 0.080
G10     354.5          62.5                2.7 +/-    0.95       3.0 +/-    0.95  0.040 / 0.080
G14     225.6          39.8                7.7 +/-    1.27      11.2 +/-    1.27  0.060 / 0.130
G21     143.0          43.6                6.6 +/-    1.15       9.0 +/-    1.15  0.050 / 0.130
G24     61.9           28.1                2.8 +/-    0.54       5.1 +/-    0.54  0.050 / 0.100
G27     259.3          34.0                5.3 +/-    1.09       8.6 +/-    1.09  0.050 / 0.090
G32     237.1          63.9                8.9 +/-    0.69       9.8 +/-    0.69  0.050 / 0.080