PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-10:27:50
G10     245.7          21.9                5.6 +/-    1.78      11.8 +/-    1.78  0.090 / 0.420
G13     60.2           33.6                2.9 +/-    0.99       4.8 +/-    0.99  0.090 / 0.440
G15     96.1           57.0                4.4 +/-    0.96       5.1 +/-    0.96  0.030 / 0.040
G16     302.9          14.7                1.0 +/-    2.96       2.4 +/-    2.96  0.030 / 0.040
G20     32.4           59.5                3.5 +/-    0.60       4.0 +/-    0.60  0.040 / 0.040
G21     329.1          57.6                2.3 +/-    0.38       2.7 +/-    0.38  0.050 / 0.030
G26     273.7          17.7                5.7 +/-    1.79      13.4 +/-    1.79  0.070 / 0.100
G29     162.1          55.3                4.5 +/-    0.55       5.4 +/-    0.55  0.070 / 0.090