PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-21:43:00
G01     248.6          34.0                9.4 +/-    0.80      15.3 +/-    0.80  0.040 / 0.050
G03     315.4          46.1                7.6 +/-    1.47      10.0 +/-    1.47  0.030 / 0.050
G11     236.1          11.6                9.9 +/-    1.90      26.8 +/-    1.90  0.070 / 0.110
G14     62.8           39.4                7.9 +/-    0.48      11.6 +/-    0.48  0.060 / 0.120
G16     164.6          18.5               11.2 +/-    1.68      25.5 +/-    1.68  0.080 / 0.310
G22     301.9          67.6                7.4 +/-    0.40       7.9 +/-    0.40  0.120 / 0.360
G23     288.1          20.2                8.7 +/-    1.28      19.1 +/-    1.28  0.030 / 0.050
G26     136.2          39.3               10.8 +/-    0.87      15.9 +/-    0.87  0.040 / 0.060
G31     40.0           57.9                7.3 +/-    0.44       8.4 +/-    0.44  0.050 / 0.090
G32     79.0           22.1                6.5 +/-    1.17      13.7 +/-    1.17  0.050 / 0.090