[gradsusr] strmden/skip

[sim.aberson]

I have a high-resolution wind analysis

  XDEF    501   LINEAR   -5.00000    0.02000
  YDEF    401   LINEAR   -4.00000    0.02000

When I plot using

   'set gxout stream'
   'set strmden -10'
   'set cint 5'
   'set clevs  5 10 02 20 25 30 35 40 45 50 55 60 65 70 75 80'
   'set ccols  9 14  4 11  5 13  3 10  7 12  8  2  6  9  5 10'
   'd urel;vrel;mag(urel,vrel)'

I get the attached.  I want even fewer streamlines than that, but the 
documentation states that density is between -10 and 10.

I tried to use skip, but that seems to only work for arrows and barbs, 
not streamlines.  I tried to create new variables using something like

   'define uskip=skip(urel,2,2)'
   'define vskip=skip(vrel,2,2)'
   'd uskip;vskip;mag(uskip,vskip)'

and I tried

   'd skip(urel,2,2);skip(vrel,2,2);mag(skip(urel,2,2),skip(vrel,2,2))'

and got the same thing for both, a blank plot.

Any suggestions?

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