PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/22-22:42:30
G01     222.7          13.4                8.9 +/-    2.08      23.1 +/-    2.08  0.040 / 0.030
G03     271.3          69.8                6.3 +/-    0.87       6.7 +/-    0.87  0.030 / 0.030
G14     91.3           20.9                6.6 +/-    1.19      14.2 +/-    1.19  0.050 / 0.080
G16     146.7          48.8                9.1 +/-    0.60      11.7 +/-    0.60  0.050 / 0.190
G22     207.2          66.5                6.8 +/-    0.67       7.3 +/-    0.67  0.040 / 0.050
G23     310.9          40.6                5.5 +/-    1.06       8.0 +/-    1.06  0.040 / 0.050
G26     90.1           55.3                7.4 +/-    0.72       8.8 +/-    0.72  0.150 / 0.250
G31     46.8           29.3                5.5 +/-    1.78       9.8 +/-    1.78  0.150 / 0.210