PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-16:12:40
G05     47.9           20.0                6.7 +/-    0.79      14.7 +/-    0.79  0.060 / 0.150
G13     80.5           37.3                8.5 +/-    0.91      13.0 +/-    0.91  0.060 / 0.160
G15     125.9          50.7               10.9 +/-    0.85      13.7 +/-    0.85  0.060 / 0.070
G18     243.7          41.7               11.0 +/-    1.51      15.5 +/-    1.51  0.050 / 0.070
G20     22.0           70.5                9.2 +/-    0.57       9.7 +/-    0.57  0.090 / 0.180
G21     314.1          48.8                8.3 +/-    0.66      10.7 +/-    0.66  0.110 / 0.210
G25     200.1          12.2               11.2 +/-    2.03      29.7 +/-    2.03  0.040 / 0.040
G26     293.5          19.3                9.4 +/-    1.39      21.0 +/-    1.39  0.040 / 0.040
G29     150.1          69.1               11.4 +/-    1.10      12.2 +/-    1.10  0.080 / 0.420