PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-19:13:00
G01     318.4          19.2                8.7 +/-    1.31      19.4 +/-    1.31  0.120 / 0.260
G08     256.3          12.3                4.4 +/-   21.99      11.6 +/-   21.99  0.180 / 0.250
G10     81.8           52.9                7.1 +/-    1.09       8.7 +/-    1.09  0.070 / 0.050
G11     302.3          23.4                7.9 +/-    1.47      16.0 +/-    1.47  0.040 / 0.050
G14     302.5          70.9                6.9 +/-    0.60       7.3 +/-    0.60  0.030 / 0.020
G18     103.9          26.3                7.3 +/-    1.21      13.8 +/-    1.21  0.030 / 0.030
G22     301.3          11.3                3.5 +/-   11.37       9.4 +/-   11.37  0.050 / 0.040
G31     177.1          42.6                8.8 +/-    0.92      12.3 +/-    0.92  0.060 / 0.040
G32     8.9            66.7                6.9 +/-    0.52       7.5 +/-    0.52  0.030 / 0.030