PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-06:57:50
G10     294.0          51.2                5.4 +/-    2.05       6.7 +/-    2.05  0.040 / 0.040
G15     46.4           29.5                3.3 +/-    1.05       5.8 +/-    1.05  0.050 / 0.030
G20     345.7          65.3                3.7 +/-    0.98       4.0 +/-    0.98  0.060 / 0.100
G21     89.5           74.2                5.3 +/-    0.28       5.5 +/-    0.28  0.060 / 0.090
G24     99.8           25.2                6.5 +/-    1.29      12.7 +/-    1.29  0.110 / 0.080
G27     305.1          31.8                3.8 +/-    0.84       6.5 +/-    0.84  0.130 / 0.060
G32     210.1          24.5                5.6 +/-    1.64      11.0 +/-    1.64  0.080 / 0.130