PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/21-20:42:50
G10     299.6          53.3                9.9 +/-    1.65      12.0 +/-    1.65  0.040 / 0.040
G15     46.1           27.8                8.7 +/-    1.59      15.9 +/-    1.59  0.040 / 0.040
G20     356.2          65.1               10.3 +/-    0.89      11.3 +/-    0.89  0.080 / 0.120
G21     95.0           74.6               11.4 +/-    0.42      11.8 +/-    0.42  0.070 / 0.170
G24     99.1           26.8               10.8 +/-    0.79      20.3 +/-    0.79  0.080 / 0.090
G27     300.7          34.4                9.4 +/-    0.88      15.1 +/-    0.88  0.090 / 0.110
G32     210.1          32.7               11.9 +/-    0.93      19.7 +/-    0.93  0.050 / 0.090