function fconv,i
	common coff,mpar,mav,ipack,incr,ioff,time,voff,xfile,irec
	common cdat,x,y,z,nx,ny,nz,nw,ntmax,date0,time0 
	a=assoc(1,fltarr(nz),ioff(i)+9*voff+(55+6*nz)*4)
	return,a(0)
end