PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-06:57:20
G10     294.0          51.2                6.3 +/-    1.10       7.9 +/-    1.10  0.060 / 0.080
G15     46.4           29.5                1.4 +/-    1.80       2.5 +/-    1.80  0.060 / 0.090
G20     345.7          65.3                3.5 +/-    0.51       3.8 +/-    0.51  0.060 / 0.050
G21     89.5           74.2                5.4 +/-    1.03       5.6 +/-    1.03  0.050 / 0.040
G24     99.8           25.2                5.7 +/-    0.50      11.0 +/-    0.50  0.040 / 0.050
G27     305.1          31.8                5.7 +/-    1.04       9.5 +/-    1.04  0.040 / 0.050
G32     210.1          24.5                4.3 +/-    2.11       8.6 +/-    2.11  0.060 / 0.120