PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-22:12:50
G02     89.4           10.0                9.8 +/-    1.90      27.4 +/-    1.90  0.040 / 0.090
G05     45.5           29.7                8.6 +/-    0.96      15.2 +/-    0.96  0.040 / 0.070
G13     90.7           36.5               12.3 +/-    0.47      19.1 +/-    0.47  0.150 / 0.300
G15     138.8          44.3               14.5 +/-    1.16      19.7 +/-    1.16  0.110 / 0.290
G18     236.9          33.5               13.8 +/-    1.66      22.5 +/-    1.66  0.080 / 0.220
G20     18.6           75.3               11.4 +/-    0.74      11.7 +/-    0.74  0.080 / 0.190
G21     303.9          41.1               11.4 +/-    1.37      16.3 +/-    1.37  0.040 / 0.090
G25     201.0          16.4               17.4 +/-    1.66      42.0 +/-    1.66  0.040 / 0.090
G26     299.9          19.1               10.9 +/-    2.22      24.5 +/-    2.22  0.020 / 0.030
G29     140.0          80.3               12.5 +/-    1.54      12.6 +/-    1.54  0.020 / 0.020