PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-06:58:00
G10     288.7          49.3                6.0 +/-    3.25       7.6 +/-    3.25  0.040 / 0.030
G15     47.4           32.8                4.4 +/-    1.14       7.3 +/-    1.14  0.050 / 0.030
G20     336.7          65.2                5.9 +/-    0.60       6.5 +/-    0.60  0.090 / 0.090
G21     75.8           75.7                7.5 +/-    0.69       7.7 +/-    0.69  0.070 / 0.100
G24     103.6          23.6                6.7 +/-    2.28      13.6 +/-    2.28  0.130 / 0.140
G27     308.5          29.7                6.1 +/-    0.96      10.8 +/-    0.96  0.130 / 0.120
G29     166.2          10.3                3.3 +/-    5.22       9.2 +/-    5.22  0.100 / 0.130
G32     208.9          20.9                6.5 +/-    2.50      13.9 +/-    2.50  0.080 / 0.140