PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-08:27:30
G10     299.8          52.4                5.3 +/-    1.61       6.5 +/-    1.61  0.090 / 0.080
G15     45.8           25.9                2.8 +/-    2.94       5.4 +/-    2.94  0.140 / 0.080
G20     57.4           42.8                4.5 +/-    0.64       6.3 +/-    0.64  0.040 / 0.060
G21     102.3          72.8                5.3 +/-    0.80       5.5 +/-    0.80  0.050 / 0.050
G24     95.7           27.2                4.2 +/-    1.29       7.9 +/-    1.29  0.040 / 0.040
G27     297.8          35.3                5.7 +/-    2.03       9.0 +/-    2.03  0.040 / 0.030
G32     211.2          35.3                7.4 +/-    2.03      11.7 +/-    2.03  0.080 / 0.110