PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-09:57:40
G05     47.9           18.6                1.7 +/-    1.84       3.8 +/-    1.84  0.170 / 0.110
G13     81.4           36.9                4.4 +/-    1.23       6.8 +/-    1.23  0.120 / 0.180
G15     126.9          50.1                6.6 +/-    0.92       8.3 +/-    0.92  0.030 / 0.040
G20     9.7            75.0                3.7 +/-    0.56       3.8 +/-    0.56  0.040 / 0.040
G21     311.3          46.4                3.4 +/-    0.91       4.5 +/-    0.91  0.050 / 0.080
G25     201.9          14.0                4.0 +/-    1.38      10.3 +/-    1.38  0.050 / 0.060
G26     291.2          20.5                5.6 +/-    1.10      12.3 +/-    1.10  0.190 / 0.350
G29     151.1          74.8                5.5 +/-    0.28       5.6 +/-    0.28  0.170 / 0.400