PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-18:58:00
G01     319.4          16.7               10.0 +/-    1.88      23.8 +/-    1.88  0.040 / 0.070
G08     259.0          13.8               10.4 +/-    3.20      26.6 +/-    3.20  0.060 / 0.060
G10     77.0           54.5               10.0 +/-    0.53      12.0 +/-    0.53  0.030 / 0.020
G11     305.1          21.9               11.3 +/-    1.23      23.8 +/-    1.23  0.020 / 0.020
G14     292.7          70.2                9.7 +/-    0.31      10.3 +/-    0.31  0.030 / 0.040
G18     101.4          28.4               10.6 +/-    1.07      19.3 +/-    1.07  0.030 / 0.030
G31     177.6          39.3               12.7 +/-    1.11      18.6 +/-    1.11  0.040 / 0.030
G32     2.8            68.8                9.3 +/-    0.48       9.9 +/-    0.48  0.040 / 0.040