PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-17:57:40
G08     295.3          22.6                7.4 +/-    0.92      15.2 +/-    0.92  0.060 / 0.120
G10     2.1            62.9                8.1 +/-    0.67       9.0 +/-    0.67  0.070 / 0.100
G14     228.6          45.0               10.6 +/-    1.01      14.3 +/-    1.01  0.040 / 0.080
G18     63.2           50.7                9.5 +/-    1.07      11.8 +/-    1.07  0.050 / 0.090
G21     144.4          36.6               13.1 +/-    1.33      20.1 +/-    1.33  0.050 / 0.090
G24     58.7           27.1                9.2 +/-    0.52      17.2 +/-    0.52  0.060 / 0.100
G27     254.8          32.3                7.7 +/-    1.05      12.9 +/-    1.05  0.050 / 0.040
G32     242.5          65.5                9.8 +/-    0.82      10.7 +/-    0.82  0.040 / 0.040