PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-06:28:10
G10     293.8          51.2                7.6 +/-    2.18       9.4 +/-    2.18  0.110 / 0.070
G15     46.5           29.7                4.4 +/-    1.27       7.7 +/-    1.27  0.120 / 0.070
G20     345.3          65.3                6.4 +/-    0.84       7.0 +/-    0.84  0.040 / 0.030
G21     88.3           74.5                7.2 +/-    0.38       7.5 +/-    0.38  0.050 / 0.040
G24     100.2          25.2                8.3 +/-    1.04      16.1 +/-    1.04  0.060 / 0.110
G27     305.2          31.8                5.5 +/-    1.15       9.2 +/-    1.15  0.070 / 0.100
G32     210.0          24.6                8.7 +/-    2.21      17.0 +/-    2.21  0.090 / 0.110