PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-06:42:40
G10     258.4          32.4                6.9 +/-    2.59      11.6 +/-    2.59  0.040 / 0.040
G13     46.9           24.8                5.6 +/-    2.43      11.0 +/-    2.43  0.030 / 0.040
G15     69.6           53.7                6.1 +/-    0.78       7.3 +/-    0.78  0.100 / 0.220
G16     286.7          14.3                3.7 +/-    1.38       9.3 +/-    1.38  0.090 / 0.230
G20     2.7            68.4                5.0 +/-    0.59       5.4 +/-    0.59  0.090 / 0.220
G21     346.1          66.3                5.8 +/-    0.61       6.2 +/-    0.61  0.100 / 0.290
G26     258.7          11.8                7.2 +/-    1.22      19.4 +/-    1.22  0.030 / 0.040
G27     321.4          12.6               -0.1 +/-    7.33      -0.2 +/-    7.33  0.030 / 0.030
G29     166.9          40.4                7.0 +/-    0.79      10.1 +/-    0.79  0.040 / 0.060