PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/18-20:27:50
G10     283.8          46.1               11.9 +/-    1.66      15.8 +/-    1.66  0.070 / 0.090
G15     48.6           36.2               10.3 +/-    0.60      15.9 +/-    0.60  0.070 / 0.100
G18     337.4          67.0               11.2 +/-    0.64      12.1 +/-    0.64  0.070 / 0.170
G20     64.6           24.7               11.5 +/-    1.65      22.6 +/-    1.65  0.070 / 0.180
G21     67.7           76.0               13.1 +/-    0.70      13.5 +/-    0.70  0.050 / 0.050
G24     108.6          22.2               14.7 +/-    1.10      30.7 +/-    1.10  0.050 / 0.050
G27     308.1          30.4               11.7 +/-    0.95      20.3 +/-    0.95  0.110 / 0.210
G29     166.2          11.6               13.6 +/-    3.27      36.7 +/-    3.27  0.110 / 0.230
G32     208.2          20.3               13.3 +/-    1.12      29.0 +/-    1.12  0.080 / 0.190