[gradsusr] no discernable X coordinate

[anca bratu]

Hi,

My name is Anca Bratu and I have a problem: 
sdfopen_nameofthefile
scanning_self-describing_file: nameofthefile
gadsdf: SDF file has no discernable X coordinate.
  To open this file with GrADS, use a descriptor file with an XDEF entry. 
  Documentation is at http://www.iges.org/grads/gadoc/SDFdescriptorfile.html

Please, if you have encountered this kind of problem, tell me exactly the steps I must follow.

Thank you!