PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-22:43:00
G01     226.6          17.2                7.2 +/-    1.74      16.9 +/-    1.74  0.040 / 0.030
G03     287.4          67.5                5.7 +/-    0.74       6.1 +/-    0.74  0.030 / 0.030
G14     86.6           24.2                8.3 +/-    0.92      16.4 +/-    0.92  0.110 / 0.340
G16     151.5          43.1               12.3 +/-    1.17      17.0 +/-    1.17  0.100 / 0.300
G22     218.8          71.2                7.5 +/-    1.01       7.9 +/-    1.01  0.030 / 0.070
G23     306.8          36.6                6.8 +/-    1.61      10.5 +/-    1.61  0.050 / 0.080
G26     101.0          54.7                7.3 +/-    1.02       8.8 +/-    1.02  0.040 / 0.090
G31     44.5           34.1                5.5 +/-    0.78       8.8 +/-    0.78  0.040 / 0.080