[Paraview] How to create streamlines from tecplot velocity data

[Danyang Su]

Dear All,

I have tecplot velocity dataset that I want to view with Paraview. I can 
successfully import the data to paraview, but neither 'cell data to 
point data' nor 'stream tracer' button is available (grey). The data set 
is in ascii format as shown below. The source data is also attached.

Would anybody please give me some tips? I am a new to paraview and only 
have basic knowledge of it.

Thanks,

Danyang

title = "dataset concrete-decalc"
variables = "x", "y", "z", "vx", "vy", "vz"
zone t = "velocities, solution time =  1.000E+02 years       " i = 83, j 
=  159, k =    1,  f=point
   0.2626316E-04  0.0000000E+00  0.1052632E-02  0.3647120E-11 
0.0000000E+00 -0.6160582E-05
   0.7878948E-04  0.0000000E+00  0.1052632E-02  0.1094119E-10 
0.0000000E+00 -0.6160582E-05
   0.1313158E-03  0.0000000E+00  0.1052632E-02  0.1823477E-10 
0.0000000E+00 -0.6160581E-05
   0.1838421E-03  0.0000000E+00  0.1052632E-02  0.2552754E-10 
0.0000000E+00 -0.6160580E-05
   0.2363684E-03  0.0000000E+00  0.1052632E-02  0.3281916E-10 
0.0000000E+00 -0.6160578E-05
   0.2888947E-03  0.0000000E+00  0.1052632E-02  0.4010932E-10 
0.0000000E+00 -0.6160576E-05
   0.3414211E-03  0.0000000E+00  0.1052632E-02  0.4739768E-10 
0.0000000E+00 -0.6160574E-05
   0.3939474E-03  0.0000000E+00  0.1052632E-02  0.5468392E-10 
0.0000000E+00 -0.6160572E-05
   0.4464737E-03  0.0000000E+00  0.1052632E-02  0.6196771E-10 
0.0000000E+00 -0.6160569E-05
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