Hi, Suppose I have to cdf files: uwnd and vwnd If I type: >use uwnd.cdf >use vwnd.cdf #I only have acces to the last file opened (vwnd.cdf) so I type: >set data uwnd.cdf #and I have access to uwnd but not to vwnd How do I can merge (or save) both file in one? for example: u_v.cdf Thanks, Antonio