PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-17:58:00
G08     295.3          22.6                8.9 +/-    1.95      18.4 +/-    1.95  0.080 / 0.100
G10     2.1            62.9                9.2 +/-    1.24      10.2 +/-    1.24  0.090 / 0.100
G14     228.6          45.0               10.3 +/-    2.06      13.8 +/-    2.06  0.120 / 0.130
G18     63.2           50.7                9.9 +/-    0.91      12.3 +/-    0.91  0.090 / 0.110
G21     144.4          36.6               12.6 +/-    0.57      19.4 +/-    0.57  0.040 / 0.020
G24     58.7           27.1                9.5 +/-    0.88      17.7 +/-    0.88  0.030 / 0.020
G27     254.8          32.3                7.6 +/-    2.26      12.6 +/-    2.26  0.090 / 0.130
G32     242.5          65.5               10.2 +/-    0.62      11.1 +/-    0.62  0.070 / 0.100