PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-04:42:30
G10     251.3          27.1                8.3 +/-    2.41      15.5 +/-    2.41  0.110 / 0.270
G13     53.0           29.7                7.3 +/-    1.76      12.8 +/-    1.76  0.090 / 0.280
G15     84.9           57.3                8.1 +/-    1.26       9.4 +/-    1.26  0.030 / 0.040
G16     294.1          15.6                6.1 +/-    1.40      15.0 +/-    1.40  0.040 / 0.040
G20     296.3          67.0                7.4 +/-    0.35       8.0 +/-    0.35  0.090 / 0.190
G21     334.1          60.4                5.7 +/-    0.72       6.5 +/-    0.72  0.070 / 0.090
G26     265.7          15.3                8.6 +/-    1.65      21.2 +/-    1.65  0.060 / 0.140
G29     165.4          49.6                8.0 +/-    0.57      10.2 +/-    0.57  0.110 / 0.140