PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-19:57:40
G01     307.3          32.9                9.3 +/-    1.22      15.3 +/-    1.22  0.070 / 0.180
G10     105.6          40.8               10.3 +/-    0.95      14.7 +/-    0.95  0.060 / 0.180
G11     283.1          28.1                8.9 +/-    1.29      16.2 +/-    1.29  0.060 / 0.100
G14     356.4          67.0                9.3 +/-    0.52      10.0 +/-    0.52  0.060 / 0.100
G18     117.5          13.0                9.9 +/-    1.31      25.8 +/-    1.31  0.070 / 0.280
G22     309.4          25.1                8.8 +/-    1.18      17.1 +/-    1.18  0.090 / 0.230
G25     82.3           16.5                9.5 +/-    1.20      22.7 +/-    1.20  0.030 / 0.050
G31     170.0          63.5               12.8 +/-    0.79      14.1 +/-    0.79  0.040 / 0.050
G32     35.0           53.3                9.5 +/-    0.43      11.5 +/-    0.43  0.030 / 0.050