PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-19:12:40
G01     320.0          14.7                8.4 +/-    0.93      21.0 +/-    0.93  0.160 / 0.320
G08     261.1          15.0               11.3 +/-    1.72      28.1 +/-    1.72  0.200 / 0.360
G10     72.9           55.8               10.6 +/-    0.47      12.5 +/-    0.47  0.130 / 0.470
G11     307.0          20.7                9.3 +/-    2.51      20.1 +/-    2.51  0.150 / 0.460
G14     285.6          69.5                9.6 +/-    0.72      10.1 +/-    0.72  0.050 / 0.090
G18     99.2           30.1               14.1 +/-    1.23      24.6 +/-    1.23  0.040 / 0.090
G27     225.6          10.8               11.1 +/-    3.84      30.6 +/-    3.84  0.030 / 0.030
G31     178.3          36.5               13.9 +/-    1.80      21.5 +/-    1.80  0.040 / 0.030
G32     356.7          70.4               10.6 +/-    0.70      11.2 +/-    0.70  0.040 / 0.040