PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-06:43:10
G10     304.1          54.3                6.3 +/-    1.40       7.6 +/-    1.40  0.060 / 0.030
G14     210.7          15.5                7.0 +/-    2.38      17.2 +/-    2.38  0.070 / 0.040
G15     45.6           23.7                3.8 +/-    2.51       7.7 +/-    2.51  0.030 / 0.030
G20     1.6            64.9                5.8 +/-    0.75       6.3 +/-    0.75  0.030 / 0.030
G21     108.2          70.4                7.0 +/-    0.72       7.4 +/-    0.72  0.060 / 0.080
G24     92.8           27.6                6.5 +/-    1.32      12.0 +/-    1.32  0.070 / 0.090
G27     298.1          34.9                6.4 +/-    1.98      10.3 +/-    1.98  0.180 / 0.510
G32     212.6          31.2                6.5 +/-    1.99      11.1 +/-    1.99  0.310 / 0.390