PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-23:27:40
G03     232.5          66.6                3.9 +/-    0.60       4.2 +/-    0.60  0.050 / 0.050
G09     304.6          19.5                5.6 +/-    1.38      12.4 +/-    1.38  0.050 / 0.050
G14     101.9          12.7                7.6 +/-    2.01      19.9 +/-    2.01  0.030 / 0.050
G16     129.9          60.3                7.5 +/-    1.00       8.5 +/-    1.00  0.030 / 0.050
G22     194.2          53.6                6.8 +/-    0.92       8.2 +/-    0.92  0.090 / 0.150
G23     320.6          50.4                3.8 +/-    0.93       4.8 +/-    0.93  0.080 / 0.150
G26     67.6           51.9                4.5 +/-    0.59       5.6 +/-    0.59  0.170 / 0.170
G31     52.9           19.4                2.6 +/-    1.51       5.8 +/-    1.51  0.120 / 0.210