PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-17:12:40
G08     309.5          18.8                6.7 +/-    1.83      15.2 +/-    1.83  0.050 / 0.080
G10     331.4          59.8                5.6 +/-    0.68       6.4 +/-    0.68  0.060 / 0.070
G14     218.5          31.2                9.2 +/-    2.69      15.7 +/-    2.69  0.050 / 0.050
G18     42.3           58.0                5.9 +/-    0.30       6.8 +/-    0.30  0.030 / 0.050
G21     134.5          51.3                8.9 +/-    0.98      11.1 +/-    0.98  0.040 / 0.090
G24     74.8           30.5                6.8 +/-    0.56      11.9 +/-    0.56  0.050 / 0.080
G27     272.8          37.5                8.0 +/-    1.42      12.1 +/-    1.42  0.040 / 0.050
G32     223.8          51.8                9.8 +/-    1.50      12.0 +/-    1.50  0.030 / 0.040