PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-21:57:40
G01     241.7          29.9               10.3 +/-    1.18      18.1 +/-    1.18  0.030 / 0.030
G03     312.6          52.5                7.9 +/-    0.80       9.7 +/-    0.80  0.040 / 0.030
G14     69.5           35.3                7.9 +/-    1.02      12.5 +/-    1.02  0.040 / 0.040
G16     161.6          24.8               11.3 +/-    0.76      22.2 +/-    0.76  0.040 / 0.050
G22     287.4          72.7                9.7 +/-    0.88      10.1 +/-    0.88  0.100 / 0.190
G23     293.1          24.4                8.0 +/-    0.91      15.9 +/-    0.91  0.090 / 0.190
G26     129.2          44.7               10.9 +/-    0.67      14.7 +/-    0.67  0.060 / 0.090
G31     39.9           51.1                7.5 +/-    0.57       9.3 +/-    0.57  0.050 / 0.090
G32     84.6           18.0                7.2 +/-    1.04      16.6 +/-    1.04  0.140 / 0.120