PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-17:58:10
G08     291.1          22.8                7.4 +/-    1.22      15.2 +/-    1.22  0.150 / 0.120
G10     11.4           63.2                9.2 +/-    0.42      10.1 +/-    0.42  0.080 / 0.090
G14     232.4          48.6               10.0 +/-    1.43      12.8 +/-    1.43  0.200 / 0.200
G18     68.4           48.4                7.9 +/-    1.16      10.1 +/-    1.16  0.170 / 0.230
G21     146.4          32.6                9.1 +/-    1.23      15.1 +/-    1.23  0.100 / 0.120
G24     54.8           25.3                8.8 +/-    3.11      17.2 +/-    3.11  0.100 / 0.120
G27     250.4          30.1                9.1 +/-    1.93      15.9 +/-    1.93  0.040 / 0.020
G32     250.9          68.9                8.0 +/-    0.34       8.5 +/-    0.34  0.040 / 0.020