PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-08:57:50
G08     315.3          14.7                3.2 +/-    2.35       7.9 +/-    2.35  0.100 / 0.280
G10     325.3          58.8                5.9 +/-    1.16       6.7 +/-    1.16  0.090 / 0.280
G14     216.9          24.3                6.3 +/-    1.63      12.6 +/-    1.63  0.070 / 0.090
G15     46.3           12.7                1.6 +/-    1.52       4.1 +/-    1.52  0.050 / 0.080
G20     71.4           33.2                4.2 +/-    0.56       6.9 +/-    0.56  0.040 / 0.030
G21     130.7          60.0                6.3 +/-    0.67       7.1 +/-    0.67  0.040 / 0.040
G24     77.9           30.1                5.3 +/-    0.86       9.2 +/-    0.86  0.080 / 0.120
G27     278.4          37.8                6.8 +/-    0.91      10.3 +/-    0.91  0.290 / 0.310
G32     220.6          50.7                6.5 +/-    0.83       8.1 +/-    0.83  0.060 / 0.140