PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/11/21-17:27:40
G10     295.6          51.4                9.1 +/-    1.98      11.3 +/-    1.98  0.080 / 0.120
G15     46.7           31.5                7.7 +/-    1.72      13.1 +/-    1.72  0.110 / 0.150
G20     349.0          65.4                9.7 +/-    0.33      10.6 +/-    0.33  0.040 / 0.040
G21     95.7           73.1                9.6 +/-    1.18      10.0 +/-    1.18  0.040 / 0.030
G24     94.6           25.5               10.9 +/-    2.06      21.1 +/-    2.06  0.060 / 0.080
G27     303.9          32.2                8.3 +/-    1.68      13.8 +/-    1.68  0.050 / 0.090
G32     209.9          30.3                9.8 +/-    2.34      17.1 +/-    2.34  0.050 / 0.090