PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-19:12:50
G01     319.0          17.7               10.1 +/-    1.58      23.6 +/-    1.58  0.050 / 0.060
G08     257.9          13.2                7.9 +/-    2.39      20.4 +/-    2.39  0.050 / 0.060
G10     78.9           53.9                9.0 +/-    0.96      10.8 +/-    0.96  0.040 / 0.030
G11     303.9          22.5                9.2 +/-    1.67      18.9 +/-    1.67  0.040 / 0.030
G14     296.7          70.6                8.9 +/-    0.50       9.4 +/-    0.50  0.030 / 0.020
G18     102.4          27.6                8.6 +/-    1.51      15.9 +/-    1.51  0.030 / 0.030
G31     177.5          40.6               10.8 +/-    0.80      15.5 +/-    0.80  0.170 / 0.350
G32     5.2            68.0                8.2 +/-    0.39       8.8 +/-    0.39  0.190 / 0.230