PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-21:58:00
G01     243.5          31.1                8.1 +/-    1.67      13.8 +/-    1.67  0.030 / 0.030
G03     313.6          50.7                6.8 +/-    0.84       8.5 +/-    0.84  0.030 / 0.030
G14     67.7           36.4                7.9 +/-    0.44      12.2 +/-    0.44  0.080 / 0.170
G16     162.5          23.0               10.6 +/-    2.14      21.7 +/-    2.14  0.090 / 0.180
G22     292.3          71.4                8.0 +/-    0.57       8.4 +/-    0.57  0.050 / 0.040
G23     291.8          23.2                7.8 +/-    1.15      16.0 +/-    1.15  0.040 / 0.050
G26     131.3          43.3               10.6 +/-    1.14      14.7 +/-    1.14  0.150 / 0.140
G31     39.7           53.0                6.9 +/-    0.61       8.4 +/-    0.61  0.120 / 0.190
G32     83.1           19.1                7.1 +/-    2.28      15.9 +/-    2.28  0.050 / 0.100