PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-17:42:40
G08     296.7          22.4                6.0 +/-    1.79      12.4 +/-    1.79  0.060 / 0.140
G10     359.4          62.8                6.3 +/-    0.66       7.0 +/-    0.66  0.050 / 0.110
G14     227.6          43.8                9.7 +/-    0.56      13.3 +/-    0.56  0.040 / 0.090
G18     61.6           51.3                6.8 +/-    0.44       8.4 +/-    0.44  0.050 / 0.100
G21     143.8          38.0                7.9 +/-    0.54      11.9 +/-    0.54  0.050 / 0.100
G24     59.9           27.6                6.5 +/-    0.85      11.9 +/-    0.85  0.060 / 0.090
G27     256.2          32.9                7.3 +/-    1.27      12.0 +/-    1.27  0.050 / 0.030
G32     240.4          64.5                8.5 +/-    1.02       9.4 +/-    1.02  0.030 / 0.030